Solution: Let \[ABCD\]be the cyclic trapezium in which \[AB\text{ }||\text{ }DC,\text{ }AC\text{ }and\text{ }BD\]are the diagonals. Required to prove: \[\left( i \right)\text{ }AD\text{ }=\text{...
(i) increases. (ii) decreases. (iii) remains unchanged. (iv) may increase or decrease. Correct Answer: (iii) remains unchanged Explanation: The enthalpy change of the reaction will not be...
The correct option is (i) B only.
Because oxygen is more electronegative than sulphur, the electron density at S in SO3 is lower, requiring more electrons to suppress the partial positive charge, making it an electrophile.
Because of its tiny size, carbon can form stable p-p bonds with itself and other small atoms like oxygen and nitrogen. In carbon dioxide, each oxygen atom has a p-p overlapping double bond with the...
Three of Döbereiner were absent at the pillars of Newlands' Octave. For example: Elements like Lithium (Li), Potassium (K) and Sodium (Na) form the Dobereiner’s Triad but are also found in the...
Uses of ethane (C2H6): 1. Ethane is used as a source of fuel. 2. Ethane is used as a refrigerant. 3. Ethane is used as a component in the natural gas. 4. Ethane is used in the preparation of ethene,...
When ethylene gas is dissolved in an alkaline solution KMnO4, it reacts with a cold Potassium permanganate solution and forms a highly volatile compound called 1, 2-Ethanediol formed by the...
The thermal decomposition of a chemical compound in the absence of air is called Pyrolysis. When thermal decomposition happens in alkanes, the process is called cracking. Cracking of alkanes is an...
1. Prop-1-ene. 2. Ethanol. 3. 3-hexene. 4.Vinegar. 5. Acetone. Answers: 1. The structure of Prop-1-ene – CH3– CH = CH2 2. The structure of Ethanol – C2H5OH 3. The structure of 3-hexene – CH3–...
The reaction when a single atom of molecule or a functional group of a compound is replaced by another atom or group of atoms is called a substitution reaction. This reaction is also known as a...
Preparation of methane: In a hard glass test tube, a mixture of powdered acetate and soda-lime is taken and heated by adjusting the test tube to the delivery tube. As the test tube mixture is...
The organic compounds having carboxyl group (COOH) are called carboxylic acids. General formula - CnH(2n+1)COOH.
Uses of acetic acid (CH₃COOH): Used as a solvent and chemical reagent Used in chemical laboratories, pharmaceutical and cosmetics. Used as a vinegar in the cooking and baking. Used in the...
1. Sources of alkanes: Petroleum and other natural gas. 2. Sources of alkynes: Crude oil, Petroleum and natural gas. 3. Sources of alcohols: Natural sources, cholesterol, retinol and so...
Physical properties of Alcohol 1. Alcohol is an inflammable, volatile and colourless liquid which is toxic. 2. Alcohol gives out a mild odour along with a burning taste. 3. Alcohols are soluble in...
Glacial acetic acid is a pure form of acetic acid that is anhydrous or water-free. Glacial acetic acid is also known as a solid acetic acid.
Ethanol is also known as ethyl alcohol is a chemical compound that is flammable, colorless liquid and its chemical formula is C2H5OH. 2. It is used as an organic solvent for many alcoholic...
The greenhouse gases are those that traps the heat from the atmosphere. Among all other greenhouse gases, methane is said to be the most potent or most important because it has the ability to absorb...
1. When ethane reacts with chlorine. 2. When ethane gas is treated with HCl. 3. When ethane is burnt in excess of oxygen. Answers: 1. Chemical equation of the reaction takes place when ethane reacts...
Chemical reaction when two or more atoms are added to the atoms of double or triple bonds to obtain a complete product. This process is called as addition reaction. Example: C2H4 + Cl2 →...
1. 3- Methylhexane 2. 4-Methyl−2-butyne 3. 2-Butene 4. 2- Butyne 5. 3,3-Dimethyl hexane Answers: 1. 2. CH3C ≡ CCH(CH3)2 3. CH3 – CH = CH – CH3 4....
A series of chemicals with same general formula, a fixed set of functional groups, with the same chemical and physical properties is the Homologous series. This series often varies with the length...
Compounds normally composed of carbon n and hydrogen atoms are called as Hydrocarbons. Examples: Methane (CH4), Ethane (C2H6), Propane (C3H8), Butane (C4H10)
Isomerism can be defined as chemicals that have the same molecular formula but different structural formulas. For example- Butane and Isobutane. Here the molecular formula of Butane and Isobutane is...
Organic chemistry can be defined as a branch of chemistry, responsible for the study of the carbon compounds, especially in living organisms and its properties, functions, and reactions.
(b) In the given equation – Identify the role played by conc.H2SO4 1. Non-volatile acid 2. Oxidising agent 3. Dehydrating agent 4. None of the above (c) Give a balanced equation for...
(b) Some properties of sulphuric acid are listed below. Choose the role played by sulphuric acid as A, B, C or D which is responsible for the reactions (i) to (v). Some role/s may be repeated 1....
(a) Sulphur (b) NaOH (c) Sugar (d) Carbon (e) Copper (a) Sulphur dioxide is produced when hot and concentrated sulphuric acid reacts with Sulphur. (b) Sodium sulphate is produced when hot and...
(a) Sulphuric acid forms two types of salts with NaOH (b) Red brown vapours are produced when concentrated sulphuric acid is added to hydrogen bromide (c) A piece of wood becomes black when...
(b) Give equations for the action of sulphuric acid on (i) Potassium hydrogen carbonate (ii) Sulphur Identify the acid in each caseThe acid which produces sugar charcoal from sugarAcid on mixing...
(i) Heat on sulphur with conc.sulphuric acid (ii) Reaction of – sugar with conc.sulphuric acid Give a balanced equation for the conversion of zinc oxide to zinc sulphateSelect the correct answer...
(a) In the production of HCl gas when it reacts with a chlorine (b) In the preparation of CO from HCOOH (c) As a source of hydrogen by diluting it and adding a strip of magnesium (d) In the...
(a) Concentrated sulphuric acid kept in airtight bottles? (b) H2SO4 is not a drying agent for H2S? (c) Sulphuric acid is used in the preparation of HCl and HNO3? Give the equation in both...
A. Acid B. Dehydrating agent C. Non-volatile acid D. Oxidizing agent Answers: (i) Dehydrating agent is responsible for this reaction. (ii) Oxidizing agent is responsible for this reaction. (iii)...
(a) Give two balanced equations to obtain SO2 in this process (b) Give the conditions for the oxidation of SO2 (c) Name the catalyst used (d) Why H2SO4 is not obtained by directly reacting...
Concentrated sulfuric acid is an oxidizing agent. Reason: This is because of the concentrated sulfuric acid in thermal decomposition producing nascent oxygen. Reaction: H2SO4 → H2SO4 + SO2...
Column 1 Substance reacted with acidColumn 2 Dilute or concentrated acidColumn 3 GasHydrogenCarbon dioxideOnly chlorine Column 1 Substance reacted with acidColumn 2 Dilute or concentrated acidColumn...
(a) dilute sulphuric acid and dilute hydrochloric acid, (b) dilute sulphuric acid and conc. Sulphuric acid (a) Barium Chloride is used to separate the dilute sulphuric acid and dilute hydrochloric...
Arsenic oxides must be removed before they can be transferred to the SO2 compound and air via the catalytic chamber as these contaminants are harmful to the catalyst. It therefore releases toxins...
(a) King of chemicals (b) Oil of vitriol (a) Sulfuric acid is often referred to as the chemical's king as it is very corrosive, strong and has a lot of applications. It is involved in one or the...
(b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide. (a) Sulphourous acid is the acid formed when sulphur dioxide dissolves in water. (b) Carbon dioxide is the...
The strong affinity of sulphuric acid towards water is the property that makes sulphuric acid a dehydrating agent.
Sodium sulphide is the gas evolved when sodium sulphide is added to a solution of hydro chloric acid in the water and the odour of the gas evolved is of rotten eggs.
(a) Sulphite is the name given to the salts of Sulphorous acid. (b) Sulphate is the name given to the salts of Sulphuric acid.
The reaction that happens between water and the concentrated sulphuric acid is an exothermic reaction. When water is added to a concentrated acid, the temperature rises abruptly. As the acid has a...
1. Dilute HCl is added to sodium carbonate crystals. 2. Copper sulphide is treated with dilute hydrochloric acid. 3. A few drops of dil. HCl is added to silver nitrate solution, followed by addition...
The following are the precautions to be taken while preparing the hydrochloric acid: 1. Protective gloves and a apron which is chemical resistant must be worn. 2. The delivery tube and the...
Hydrogen chloride gas cannot be dried over quicklime as it reacts with the HCl gas and undergoes a chemical reaction. Reaction Involved: 2HCl + CaO → CaCl2 + H2O
1. NH4OH + HCl → 2. Pb(NO3)2 +HCl → 3. HCL + NH4OH → 4. NH3 + HCl → Answers: 1. Completed balance reaction - NH4OH + HCl →NH4Cl + H2O. 2....
Correct Answer: (2) Concentrated Sulphuric acid Explanation: The hydrochloride gas cannot be dried using drying agents like phosphorus pentoxide and anhydrous calcium chloride as they...
Hydrogen chloride and Ammonia gas are the two gases which can be used in the study of the fountain experiment.
Manganese dioxide (MnO2), red lead and Lead(IV) oxide (PbO2) react with conc. HCl acid to liberate Cl2. The property that is common in all these metal oxides are that the hydrochloric...
1. A solution of HCl in water. 2. A solution of HCl inToluene . 1.The solution of HCl in water is electrolyte. When hydrogen chloride gas dissolves in water, hydrochloric acid is formed. The...
When Lead nitrate solution is mixed with dilute hydrochloric acid and heated, the product which formed is a white precipitate of the lead (I) chloride (PbCL2). Reaction Involved:...
1. Iron + dilute hydrochloric acid 2. Ammonia + dilute hydrochloric acid 3. Iron(II) sulphide +dilute hydrochloric acid 4. Magnesium sulphite + dilute hydrochloric acid 5. Sodium hydrogen carbonate...
1. Silver nitrate solution + hydrochloric acid → 2. Magnesium foil + hydrochloric acid → 3. Caustic soda solution + hydrochloric acid → 4. Zinc carbonate + hydrochloric...
Substance AddedGas EvolvedOdourCalcium CarbonateMagnesium ribbonManganese(IV) oxide with heatingSodium sulphide Substance AddedGas EvolvedOdourCalcium CarbonateCarbon dioxideOdourlessMagnesium...
Hydrochloric acid can be converted to chlorine by adding concentrated hydrochloric acid and nitric acid. Reaction Involved: 3HCL (conc) + HNO3(conc) → NOCL + 2H2O + 2 [Cl]
Uses of Hydrochloric Acid: Hydrochloric acid is used in the purification of table salt. Hydrochloric acid is used as neutralizers and pH control. Hydrochloric acid is used as a pool cleaning agent....
Physical properties of Hydrogen Chloride Gas: Hydrogen Chloride Gas colorless gas. Hydrogen Chloride Gas has a sour taste and a foul odor. Hydrogen Chloride Gas is highly soluble in water and other...
With the following experimental steps, it can be proven that the hydrochloric acid contains hydrogen chlorine. 1. Take a voltmeter used for water electrolysis, fitted with a platinum cathode and...
Hydrogen chloride and Ammonia are the colourless gas which when combined forms a white solid.
The dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2 per cent because the molecules present in the dilute HCl acid gets mixed with the water vapour.
Concentrated Sulfuric acid (H2SO4) is the acid used in the preparations of Hydrogen Chloride gas.
1. Ammonium chloride & Calcium hydroxide 2. Ammonium chloride & Sodium nitrite Answers: 1. Ammonia is the resultant gases when ammonium chloride and calcium hydroxide are heated. 2....
Ammonia is lighter than wind, and 0.589 times denser than the air so the displacement method is used to collect ammonia. In addition, ammonia cannot be collected using water because it is very...
Ammonia pressure is low enough to produce the required temperatures in the refrigerator. It also carries more heat per kg than other traditional refrigerators. In addition, it does not damage the...
(a) Ammonia ions are formed when ammonia is dissolved in water because the molecules of ammonia is basic in nature. (b) Hydroxyl ions are also formed when ammonia is dissolved in water.
An alternative and suitable form of chlorofluorocarbon is ammonia which is in the liquid state. It is also natural and does not cause some of the effects of the earth as chlorofluorocarbon.
Ways to identify ammonia gas: 1. The ammonia gas has a pungent odour. 2. It turns a wet yellow litmus paper into brown colour, a wet red litmus paper into blue colour, and phenolphthalein solution...
Ammonium chloride is the salt produced by the reaction of a basic gas and an acid gas.
1. Name the metallic chloride which is soluble in ammonium hydroxide. 2. Name the gas formed when ammonia is burnt in an atmosphere containing oxygen (no catalyst present) Answers: 1. Silver...
Hydrogen chloride is the acidic gas that reacts with a basic gas like ammonia, resulting in the formation of neutral gas.
1. What is the gas created by Haber’s process? 2. The two gases, when combined with ammonia, gives dense, white fumes. Answers: 1. Ammonia is the gas created by Haber’s process. 2. Chlorine and...
1. What is the gas created by Haber’s process? 2. The two gases, when combined with ammonia, gives dense, white fumes. Answers: 1. Ammonia is the gas created by Haber’s process. 2. Chlorine and...
In two test tubes containing the ferric salt and ferrous salt, ammonium hydroxide is added using a dropper. 1. Test tube containing ferrous salt gives a dull-green precipitate. 2. Test tube...
When ammonium hydroxide is added to the aqueous solution of Iron(II) sulfate, a green-ish precipitate of ferrous hydroxide is formed and this precipitate is insoluble in the ammonium hydroxide....
When ammonium hydroxide is added to the aqueous solution of Zinc nitrate occurs, a gelatinous white precipitate of zinc hydroxide is formed and this precipitate is soluble in the ammonium hydroxide....
Applications of ammonia: 1. Ammonia is used primarily as a fertilizer 2. Ammonia is also used as a refrigerator gas 3. Used in the production of explosives and plastics 4. It is used in the...
1. What is gas ‘Z’? 2. State ‘Z’s’ formula. Answers: 1. Gas Z - Ammonia 2. Formula of Ammonia - NH3
Odd one: Ammonia Reason: Sulphur dioxide, carbon dioxide and hydrogen chloride are acidic in nature whereas ammonia is basic in nature.
Balanced equation for the reaction that occurs between sulphuric acid and ammonia: 2NH3 + H2SO4→(NH4)2SO4
The fountain experiment demonstrates that due to the high solubility rate and acidic nature the hydrochloride gas (HCl gas) dissolves in water. In this experiment the solution of blue litmus...
The ammonia is a colorless, odorless gas, hydrogen and nitrogen compound. It is lighter than wind, and 0.589 times denser than the air.
(a) Washing soda crystals (b) Iron (III) chloride salts are exposed to the atmosphere. Answers: (a) Washing soda crystals loses few water molecules and forms its monohydrate. Reaction...
(a) What name is given to the water in the compound copper sulphate-5-water? (b) If copper sulphate-5-water is heated, anhydrous copper sulphate is formed. What is...
(a) Na2CO3 solution (b) NaCl solution (c) NH4NO3 (d) MgCl2 Solution Answers: (a) Na2CO3 solution - Red litmus turns to blue (b) NaCl solution - No change in...
(a) Acidic (b) Basic and (c) Neutral solution. Give a balanced equation for each reaction. Answers: (a) Acidic - Iron chloride (FeCl3) Reaction Involved: FeCl3 + 3H2O → 3HCl...
(b) How can this impurity be removed? (c) Name a substance which changes the blue colour of copper sulphate crystals to white. (d) Name two crystalline substances which...
(a) Solid NaOH (b) Solid CaCl2 (c) Solid Na2CO3.10H2O (d) Conc. sulphuric acid (e) Iron (III) chloride Answers: (a) Solid NaOH – Increases in mass when...
(a) Sodium hydrogen sulphate is not an acid, but it dissolves in water to give hydrogen ions according to the equation NaHSO4 ⇌ H+ + Na+ + SO42-...
The concentrated Sulfuric acid (H2SO4) is hygroscopic in nature and can remove moisture from some substances, so it is used as a drying agent. Also, it can be used as a dehydration agent due to its...
Drying agentsDehydrating agentsRemoves moistureRemoves chemically joined elements of waterUsed to dry gases and used in desiccators to keep the substances dry.Prepares substances like...
(b) Define deliquescence. Give examples. (a) Efflorescence is the property of a certain salt to completely lose, or partially their crystallization water when their crystals are exposed to dry air...
Give four substances which contain water of crystallisation and write their common names. Some salts, in turn, combine with a specific number of water molecules that enter a loose chemical reaction...
(i) If M is a metal, then the litmus will turn _____. (ii) If M is a non-metal, then the litmus will turn _____. (iii) If M is a reactive metal, then _____ will be evolved when M...
(a) Direct combination (b) Displacement (c) Double decomposition (precipitation) (d) Neutralisation of insoluble base (e) Neutralisation of an alkali (titration) Answers:...
ReactantsProductsMethodSoluble base + Acid (dil)Salt + waterNeutralisation TitrationMetal + Non-metalSalt (soluble/insoluble)……………Insoluble base +Salt (soluble) + water…………….Active metal + Acid...
A Action of an acid on a metal B Action of acid on an oxide or carbonate C Direct combination D Neutralisation of alkali by an acid E Precipitation (double decomposition) (i) Copper...
(a) A soluble base. (b) The insoluble solid formed when two solutions are mixed together. (c) An acidic solution in which there is only partial ionisation of the solute molecules. Answers:...
(b) Write the balanced equation for the reaction of: A named acid and a named alkali. Answers: (a) Ca(H2PO4)2 is an example of a compound called acid salt. (b) Reaction Involved:...
(a) an acid salt (b) an insoluble chloride (c) on treating with concentrated sulphuric acid, this salt changes from blue to white (d) on heating, this salt changes from...
(a) Sodium sulphate (b) Copper sulphate (c) Iron(II) sulphate (d) Zinc carbonate Dilute sulphuric acidCopperCopper carbonateIronSodium...
(a) A is a sodium salt. (b) B is an insoluble salt. (c) C is a soluble salt of copper. (d) D is a soluble salt of zinc. Answers: (a) Preparation - Neutralisation Reaction...
NaOH, Na2CO3, H2O, Zn(OH)2, CO2, HCl, Fe, H2SO4, Cl2, Zn Using suitable chemicals from the given list only, state briefly how you would prepare: (a) Iron(III) chloride, (b) Sodium sulphate, (c)...
(a) A soluble sulphate by the action of an acid on an insoluble base, (b) An insoluble salt by the action of an acid on another salt, (c) An insoluble base by the action of a soluble base...
(a) Give a reaction, mentioning clearly acid and base used in the reaction. (b) If one mole of a strong acid reacts with one mole of a strong base, the heat produced is always same. Why? Answers:...
(b) Classify the following solutions as acids, bases or salts. Ammonium hydroxide, barium chloride, sodium chloride, sodium hydroxide, H2SO4 and HNO3 (a) The pH of pure water is 7 and the pH does...
Zinc Sulphate Precipitation Ferrous sulphide Oxidation Barium Sulphate Displacement Ferric sulphate Neutralisation Sodium sulphate Synthesis Answers:...
(a) It is necessary to find out the ratio of reactants required in the preparation of sodium sulphate. (b) Fused calcium chloride is used in the preparation of FeCl3. (c) Anhydrous FeCl3 cannot...
(a) Blue litmus is introduced into a solution of hydrogen chloride gas. (b) Red litmus paper is introduced into a solution of ammonia in water (c) Red litmus paper is introduced in Caustic soda...
An acid is a compound which when dissolved in water forms hydronium ions as the only …………… ions. A base is a compound which is soluble in water and contains …………….. ions. A base reacts with an acid...
(a) A chloride which is insoluble in cold water but dissolves in hot water, (b) A chloride which is insoluble, (c) Two sulphates which are insoluble, (d) A basic salt, (e) An acidic salt,...
A – Direct combination of two elements. B – a reaction of dilute acid with a metal. C – a reaction of dilute acid with an insoluble base. D – Titration of dilute acid with a solution of soluble...
(a) Copper sulphate crystals from a mixture of charcoal and black copper oxide, (b) Zinc sulphate crystals from Zinc dust (powered Zinc and Zinc oxide) (c) sodium hydrogen...
(a) What is salt? (b) What kind of salt is prepared by precipitation? (c) Name a salt prepared by the direct combination. Write an equation for the reaction that takes place in preparing the salt...
(a) Common salt: Normal salt is a salt formed by the complete replacement of hydrogen atoms with a metallic or ammonium ion. Eg: Na2SO4, NaCl (b) Acidic salts: Acid salts are formed by the...
(a) will liberate ammonia from ammonium sulphate on heating? (b) is a strong acid? (c) contains molecules as well as ions? (a) Solution P will liberate ammonia from...
(b) If a solution changes the colour of litmus from red to blue, what can you say about its pH? (c) What can you say about the pH of a solution that liberates carbon dioxide from...
The universal index is a pH index made of a mixture of dyes and several compounds that show many smooth color changes at different pH range, depending on the strength of the acid or base. By showing...
Things like chocolates and sweets are degraded by germs in our mouths. Tooth decay in humans begins when the pH falls below 5.5. Therefore, due to the low pH values, their tooth enamel which is the...
(a) Increase the pH value (b) Decrease the pH value of a neutral solution? (a) An alkali can be added to increase the pH value of a solution. (b) An acid can to be added to decrease...
(a) A common acid-base indicator and a universal indicator (b) The acidity of bases and basicity of acids (c) Acid and alkali (other than indicators) (a) A common acid-base indicator and a...
A = 1.8, B = 7, C = 8.5, D = 13 and E = 5 Classify these solutions as neutral, slightly or strongly acidic and slightly or strongly alkaline. Which solution would be most likely to liberate hydrogen...
The strength of acids and alkalis is expressed in terms of hydrogen ion concentration which is represented as pH. The solution with pH value 10 is basic in nature so, it will give pink colour with...
IndicatorNeutralAcidicAlkalineLitmus PhenolphthaleinPurple Colourless IndicatorNeutralAcidicAlkalineLitmus PhenolphthaleinPurple ColourlessBlue to red ColourlessRed to blue Pink
It is known that alkalis react with oil to form soap. Since our skin contains oil so when we touch strong alkalis, a reaction happens and a soapy solution is created. Therefore, it is recommended...
(a) Acid + Active metal → Salt + Hydrogen (b) Acid + base → Salt + Water (c) Acid + Carbonate or bicarbonate → Salt + Water + carbon dioxide (d) Acid...
(a) A base from another base (b) An alkali from a base (c) Salt from another salt? (a) The base can be obtained from another base with double decomposition. The aqueous solution of salt at the base...
(b) ls PbO2 a base or not? Comment. (c) Do basic solutions also have H+(aq)? Explain why they are basic by taking an example? (a) Since dry HCl gas has no hydrogen ions in it compared...
Since, HCl and HNO3 ionize in aqueous solution and produce hydrogen ions these reflect the acidic character. While ethanol and glucose does not ionize in an aqueous solution.
We know that the bases turn red litmus into blue. Therefore, when a drop is placed in each test tube on a red litmus paper that turns blue can easily be seen as a base. After that, the remaining...
(a) A basic oxide which is soluble in water, (b) A hydroxide which is highly soluble in water, (c) A basic oxide which is insoluble in water, (d) A hydroxide which is insoluble in water, (e) A weak...
(a) bases in solution, (b) an acid. (a) Hydroxyl ion (OH–) is furnished by basic solution. (b) Hydrogen ion (H+) is furnished by acidic solution.
(a) an alkali and a base, (b) the chemical nature of an aqueous solution of HCl and an aqueous solution of NH3. Answers: (a) AlkaliBaseSoluble in water Insoluble in waterAll alkalis are...
Alkali is a basic hydroxide that when dissolved in water produces hydroxyl ions (OH–) as the only ion-charged ions. Examples: (a) Sodium hydroxide NaOH, Potassium hydroxide KOH (b) Calcium hydroxide...
ElementWXYZElectronic configurations2, 8, 12, 8, 72, 51 Answer the following questions based on the table above: (i) What type of bond is formed between: 1. W and X 2. Y and Z...
A. Crystalline hard structure B. A low m.p. and low b.p. C. An ionic bond D. A strong force of attraction between its molecules (b) The molecule which contains a triple...
(b) Among the compounds, identify the compound that has all three bonds [ionic, covalent and coordinate bond]. A. Ammonia B. Ammonium chloride C. Sodium hydroxide D. Calcium...
(b) There are three elements E, F, G with atomic number 19, 8 and 17, respectively. Give the molecular formula of the compound formed between E and G and state the type of chemical bond in this...
iii. A molecule of ……………. contains a triple bond. [hydrogen, ammonia, nitrogen]. (b) By drawing an electron dot diagram, show the lone pair effect leading to the formation of ammonium ion...
A. Oxidation B. Reduction C. Redox D. Displacement (b) Select the right answer. i. Sodium chloride _______ covalent bond / ionic bond / covalent and coordinate...
A. Sodium chloride B. Ammonia C. Carbon tetrachloride D. Ammonium chloride (b) Draw the structural formula of carbon tetrachloride and state the type of...
(b) What are the terms defined below? (i) A bond formed by a shared pair of electrons, each bonding atom contributes one electron to the pair. (ii) A bond formed by a shared pair of electrons...
(b) Can Q and S both be metals? Justify your answer. (c) The property which is characteristic of an electrovalent compound is that A. it is easily vaporised B. it has a high...
(i) Is Y getting oxidised or reduced? (ii) What charge will Y migrate to during the process of electrolysis? (b) Acids dissolve in water and produce positively charged ions....
Choose the letter corresponding to the correct answer from the options A, B, C and D given below: (i) The type of bonding in X will be A. ionic B. electrovalent C. covalent...
(a) When the nuclei of two reacting atoms are of _____ mass, then a bond so formed is called _____covalent bond. (Equal, unequal, polar, non -polar). (b) In case of the non-polar covalent bond, the...
(b) How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration? (a) Atoms present in the molecules: Calcium oxide (CaO) molecule contains...
Answers: (a) Bond present in Water - Polar covalent bond (b) Bond present in Calcium oxide - Ionic bond (c) Bond present in Hydroxyl ion - Single covalent bond ...
SodiumPhosphorusCarbonFormula of chlorideNature of bondingThe physical state of chloride SodiumPhosphorusCarbonFormula of chloride NaCl PCl5 CCl4Nature of bonding Ionic...
[(a) Na (b) Mg (c)Al (d) Si] Answer: Correct Answer: (b) Mg Explanation: Element M forms a chloride with the formula MCl2 which is solid with a high melting point. M would most likely be in the...
(i) Hydronium ions (ii) Ammonium ion (iii) Hydroxyl ion State the type of bonding present in them. (b) Give two examples in each case: (i) Co-ordinate bond compounds (ii) Solid covalent compounds...
The bond formed between two atoms by the sharing of two electrons is fully supplied by the joining atoms but shared by both of them is called the coordinate bond. This bond is represented by an...
The pair of electrons that is not shared with any of the other atoms are called lone pair of electrons and is responsible for the formation of the coordinate bond. The pair of electrons shared...
Answer: At the cathode, greyish white metal lead is created, whilst at the anode, dark reddish-brown gases are formed.
Solution: a. Na+ ions and OH– ions b. H+, HCO3, CO32- ions and H2CO3 molecules c. C12H22O11 molecules
Solution: Answer: i)M+ + 1e– → M ii) Oxygen gas is produced at the anode. Explanation: i) The activity series gives us a metal oxide M2O of metal ‘M'. M2O dissolves in water to generate hydroxide...
Answer: Copper is a metal that contains free electrons. Electricity is conducted through the movement of free electrons. Copper, on the other hand, does not dissolve into ions. As a result, it does...
Solution: a) In the solid-state, the electrostatic forces of attraction between molecules are extremely strong, attracting molecules to one another. In the fused state, these forces grow weaker, and...
Answer: During the oxidation process, electrons are released, and the anode has a sufficient concentration of electrons to allow for the release of electrons. As a result, the anode serves as the...
Answer: Galvanisation Explanation: Anodizing is the process of electroplating. Electroplating is the technique of plating a metal on another metal using hydrolysis.
Answer: Hydrogen chloride gas does not conduct electricity when dissolved in water. In a diluted state, electrons can flow freely. Thus, it can conduct electricity and extract hydrogen from acids....
Solution: Non-electrolytes, on the other hand, are notoriously poor conductors of electricity. In addition, the solutions of these non-electrolytes do not transmit electrical currents. Liquid carbon...
Answer: An aqueous solution of sodium chloride conducts electricity because it is a soluble ionic compound that, when dissolved in water, dissociates into two ions: Na ion and Cl ion, both of which...
Answer: Ammonium hydroxide solution - This solution contains both ions and molecules of ammonium....
Answer:
Answer: It is believed to be an example of catalysis since pure water is not a good conductor of electricity, but when acid is introduced it catalyzes the ionization of water, and water is...
Solution: (i) a. Nickel sulfate b. Article c. Pure nickel plate (ii) a. Ni2+ + 2e– → Ni b. Ni – 2e– → ...
and 
ions. Solution: Ni2+ ions move towards the cathode. If Reaction At anode: (with nickel electrodes) As a result, nickel dissolves from the anode and is replaced by nickel ions. If platinum...
Electrolysis of molten Lead bromide,The reaction that takes place at the anode:$$2 Br ^{-} \rightarrow Br _{2}$$Reaction that takes place at cathode:$$Pb ^{+2}+2 e ^{-} \rightarrow Pb$$Lead bromide...
b) HCl 
d) 
Solution:Answer is option d) Due to the fact that acetic acid is a good electrolyte, it dissociates very little and generates few ions, resulting in a solution that contains both molecules and ions....
Solution: Sodium chloride is created when sodium carbonate crystals are added to liquid HCl, along with water and carbon dioxide gas. A brisk effervescence develops. The neutralisation reaction is...
. Which of the solutions will finally turn blue?Answer: The colour of AgNO3 changes to blue. This is due to copper's higher position in the electrochemical series, which causes it to displace silver and generate Cu(NO3)2, which is blue in...
Solution: Essentially, a redox reaction is a chemical event in which electrons are transferred between the two reactants that are involved in the reaction. The migration of electrons can be...
Solution: Because diluting acid entails adding water to a concentrated acid, suitable safety precautions must be observed prior to beginning the process. The laboratory's safety precautions are...
Solution: X → X2+ + 2e– ; Y + 3e– → Y3-Y2 + 3X → X3 Y2Cathode, anode
Solution: Because hydrogen chloride is acidic and quick lime is basic, the two will react and quick lime will not be able to dry hydrogen chloride. 2HCl + CaO → CaCl2 + H2O
Solution:
Answer: Potassium reacts with water in a variety of ways. Therefore, electrolysis of its aqueous salt solution is ruled out as an alternative method of production.
Solution: i)...
Solution: Conc. sulphuric acid. HCl is dried by passing through concentrated sulphuric acid.HCl gas can't be dried using drying agents like P2O5 and CaO and since they react with HCl....
Answer: g) Because ammonia is a covalent molecule, it is unionized in the gaseous state, but it produces $NH_4OH$ in an aqueous solution, which can dissociate into ions when exposed to water. h)...
Answer: e) In the electrolytic reactions, 4H1+ is required at the cathode and 4OH...
Solution: Hydrogen chloride and ammonia gas. At a basic level, the experiment covers principles like solubility and gas laws. When litmus is added to the reaction mixture, it illustrates the...
Answer: c) During the melting process of lead bromide, the ions are free and loosely packed. It is because of the electrostatic force of attraction that the ions are closely packed in the...
Solution: Conc. HCl acid reacts with manganese dioxide (MnO2), red lead, and lead(IV) oxide (PbO2) to liberate Cl2. All of these metal oxides illustrate that oxidising agents oxidise hydrochloric...
Solution: A solution of HCl in water acts as an electrolyte. Hydrochloric acid is generated when hydrogen chloride gas is dissolved in water. Because of its polar nature, the covalent molecule...
Solution: a) Bromine loses electrons at the anode of lead bromide electrolysis, while lead gets electrons at the cathode of lead bromide electrolysis. As a result, it is classified as a redox...
Solution: Inverted funnels are employed in the manufacture of hydrochloric acid. They increase the surface area available for gas absorption while simultaneously reducing the back suction of...
a) Zinc sulfate reacts with NaOH in both feasible amounts and excess. b) Copper sulfate reacts with $NH_4OH$ in both feasible amount and excess.
Answer: (a) Amphoteric oxides are substances that react with both acids and alkalis to produce salt and water as byproducts. (b) ZnO + 2NaOH → Na2ZnO2 + H2O Al2O3 +...
Answer: a) In the presence of hot concentrated caustic soda or hot concentrated sodium hydroxide, zinc reacts to form zincate sodium and hydrogen. Zn + 2NaOH → Na2ZnO2 + H2 b) Aluminum reacts with...
Solution: They can be identified by dissolving them in dilute nitric acid and then dissolving them in excess ammonium hydroxide. When lead carbonate is dissolved in weak nitric acid, and then...
Solution: a) The interaction of sodium hydroxide and ammonium hydroxide with calcium salt produces a milky white precipitate Ca(OH)2, whereas the reaction of sodium hydroxide and ammonium hydroxide...
Solution: (c) The combination of sodium hydroxide and ammonium hydroxide with copper salt produces a pale blue-colored precipitate, whereas the reaction with ferrous salt solution produces a dirty...
Answer: (e) The reaction of ammonium hydroxide with lead nitrate produces a chalky white insoluble precipitate, but the reaction with ferrous nitrate does not produce any precipitate.
solution and the other contains NaOH solution. How will you identify them by a chemical test?Solution: Calcium salts, such as calcium chloride, can be used to distinguish between reagent bottles A and B Ca(NO3)2. On adding NaOH to Ca(NO3)2, a white precipitate Ca...