Test
Chloride radical is detected by the chromyl chloride test. In this test, chromyl chloride gas (orange red color) is produced. Equation Involved – 4NaCl + K2Cr2O7 + 6H2SO4 → 4NaHSO4 + 2KHSO4 + 3H2O +...
The lanthanide contraction is the decrease in the atomic or ionic radii with increase in the atomic number of lanthanides
Lanthanide elements resembles a lot in properties with lanthanum. Lanthanide is group of 14 elements from atomic number 58 to 71. In these elements on increasing atomic number electron enters into...
2KMnO4 + 8H2SO4 + 10KI → 6K2SO4 + 8H2O + 5I2 2KMnO4 + 5SO2 + 2H2O → 2MnSO4 + 2H2SO4 + K2SO4 2KmO4 + 16HCl → 2KCl + 2MnCl2 + 8H2O + 5Cl2 5COOH – COOH + [5O] → 10CO2 + 5H2O
Answer: Double salt Complex salt A double salt is a combination of two salt compounds. A complex salt is a molecular structure that is composed of one or more complex ions. Double salts can give...
Answer: DNA RNA DNA – Deoxyribo Nucleic Acid RNA – Ribo Nucleic acid DNA consists of adenine (A), cytosine (C), guanine (G), and thymine (T) RNA consists of adenine (A), cytosine (C), guanine (G),...
![\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c5a91864ba7e1e0ed1b5d273d822f5e5_l3.png "Rendered by QuickLaTeX.com")
(b) ![\left[\mathrm{Pd}(\mathrm{CN})_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-ffda616d3dbe7dc8925722e87005924e_l3.png "Rendered by QuickLaTeX.com")
(c) ![\left[\mathrm{PdCl}_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-90cc6a4f4d42dee46e06d6f8ed516b7a_l3.png "Rendered by QuickLaTeX.com")
(d) ![\left[\mathrm{NiCl}_{4}\right]^{2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-149ee5c95bd9cfcc4405704fba2e1bab_l3.png "Rendered by QuickLaTeX.com")
SOL: Correct option is D. $\left[\mathrm{NiCl}_{4}\right]^{2}$
(d) all of theseSol: Correct option is B. 0
Solution: (i) is e (ii) is d (iii) is a (iv) is b (v) is f (vi) is c
Solution: (i) is c (ii) is d (iii) is a (iv) is b
Solution: (i) is b (ii) is e (iii) is d (iv) is a (v) is c
Solution: (i) is d (ii) is e (iii) is a (iv) is b (v) is c
Solution: Both reactions resemble each other. In Friedel Craft’s acylation reaction, an aryl group or benzene is treated with an acid chloride in the presence of anhydrous AlCl3 and corresponding...
Solution: This is due to the formation of polysubstituted products. To avoid the formation of polysubstituted products Friedel-craft’s alkylation reaction is not used for the preparation of...
Solution:
Solution: Due to the resonance in carboxylic acids, the negative charge is at the more electronegative oxygen whereas, in alcohols or phenols, the negative charge is on a less electronegative atom....
Solution: Compound A = CH3-MgBr Compound B = CH3-COOH Compound C = CH3COOCH3
Solution: The oxygen atom in carbonyl compound pull more shared pair of electron towards itself and so, carbon acquires partial positive charge and oxygen acquires partial negative charge in...
Solution: Both the compounds carbon atom is attached to the electronegative atom oxygen. Thus the oxygen pulls more shared pair of electron towards them and a partial positive charge will be...
Solution: NO2CH2COOH > FCH2COOH > C6H5COOH. NO2CH2COOH is most acidic among the given three compounds. Electron withdrawing groups like -NO2, increases the acidity of carboxylic acids by...
Solution: Compound ‘A’ belongs to the carboxylic acid. Compound ‘B’ belongs to alcohol. Compound ‘C’ belongs to an ester group.
Solution: When propanal reacts with 2-methyl propanal in the presence of NaOH, the mixture of aldehydes are formed. Both the reactants have an alpha-hydrogen and hence, can undergo cross aldol...
Solution: FCH2COOH > ClCH2COOH > C6H5CH2COOH > CH3COOH > CH3CH2OH. CH3CH2OH is least acidic among the given compounds. C6H5CH2COOH is more acidic than CH3COOH due to the resonance in...
Solution: Solution: The products formed on oxidation of 2, 5-dimethylhexan-3-one are the mixtures of ketone and carboxylic acids. Ketone is then further oxidized to carboxylic acids. Overall the...
Solution: The electrophile produced in the reaction of benzene with benzoyl chloride in the presence of anhydrous AlCl3 is benzoylinium cation. The product formed in this reaction is benzophenone....
SOLUTION: Toluene is first converted to benzal chloride by side-chain chlorination, in presence of Chlorine gas and light. Benzal chloride on hydrolysis at 373K gives benzaldehyde.
Solution:
Solution: (i) Ethane-1,2-dial. (ii) Benzene-1, 4-dicarbaldehyde. (iii) 3-Bromobenzaldehyde.
Solution: (i) 3-Phenylprop-2-ene-1-al. (ii) Cyclohexanecarbaldehyde (iii) 3-Oxopentan-1-al (iv) IUPAC name: But-2-enal
, and 
.Solution: The difference in electronegativity between constituent atoms determines the ionic character of a molecule. As a result, the greater the difference, the greater the ionic character of a...
Solution: The bond pair of electrons are not shared equally when two unique atoms with different electronegativities join to form a covalent bond. The bond pair is attracted to the nucleus of an...
Solution: "Electronegativity refers to an atom's ability to attract a bond pair of electrons towards itself in a chemical compound." Sr. No Electronegativity Electron affinity 1 A tendency to...
Solution: There is a difference in electro-negativities of constituents of the atom in a heteronuclear molecule, which causes polarisation. As a result, one end gains a positive charge, while the...
and 
are triatomic molecules, the shape of the molecule is bent while that of is linear. Explain this on the basis of dipole moment.Solution: $CO_2$ has a dipole moment of 0 according to experimental results. And it's only possible if the molecule's shape is linear, because the dipole moments of the C-O bond are equal and...
Solution: Below is a list of Lewis symbols. To form a cation, a metal atom loses one or more electrons, while a nonmetal atom gains one or more electrons. Ionic bonds are formed between cations and...
Solution: Below is a list of Lewis symbols. To form a cation, a metal atom loses one or more electrons, while a nonmetal atom gains one or more electrons. Ionic bonds are formed between cations and...
The correct answer is a) number of charge carriers can change with temperature T b) time interval between two successive collisions can depend on T
, and 
Solution: Resonance is the phenomenon that allows a molecule to be expressed in multiple ways, none of which fully explain the molecule's properties. The molecule's structure is called a resonance...
ion.Solution: However, while the carbonate ion cannot be represented by a single structure, the properties of the ion can be described by two or more different resonance structures. The actual structure...
Solution: Bond length is defined as the equilibrium distance between the nuclei of two bonded atoms in a molecule.
Solution: During the formation of a molecule, the extent of bonding that occurs between two atoms is represented by the bond strength of the molecule. As the bond strength increases, the bond...
Solution: $BeCl_2$ The central atom does not have a lone pair, but it does have two bond pairs. As a result, its shape is AB2, or linear. $BCl_3$ The central atom has three bond pairs but no lone...
Solution: “Atoms can combine either by transferring valence electrons from one atom to another or by sharing their valence electrons in order to achieve the closest inert gas configuration by having...
and 
and 
Solution: For S and S2- A sulphur atom has only 6 valence electrons, which is a very small number. As a result, the Lewis dot symbol for the letter S is The presence of a...
Solution: Boron atoms have only three valence electrons, which is a very small number. As a result, the Lewis dot symbols for B are as follows: The oxygen atom has only six valence...
Solution: One can differentiate between pentan-2-one and pentan-3-one by iodoform test. Pentan-2-one have a –CO-CH3 group and therefore forms a yellow precipitate of Iodoform. Pentan-2-one gives a...
Solution: Butanal has no intermolecular hydrogen bonding but butan-1-ol has intermolecular hydrogen bonding. This bonding in butan-1-ol makes it more stable at a higher temperature than butanal.
Solution: Option (A) and (B) are the answers. Reason:
Solution: Option (i) and (ii) are the answers Reason: Benzophenone can be obtained by the Friedel-Craft acylation reaction. The reaction is shown as
Solution: Option (i) and (iii) are the answers. Reason: Grigned reaction and aldol condensation is used to increase the number of carbon attom in the chain as follows:
Solution: Only two valence electrons exist in the magnesium atom. As a result, the Lewis dot symbols for Mg are as follows: Only one valence electron exists in the sodium atom. As a...
Solution: Option (ii) and (iv) are the answers. Reason: The carbonyl group of aldehydes and ketones is reduced to CH2 group on treatment with zinc amalgam and concentrated hydrochloric acid...
Answer: "A chemical bond is an attractive force that holds a chemical species' constituents together." For chemical bond formation, many theories have been proposed, including valence shell electron...
Solution: Option (ii) and (iii) are the answers. Reason: Treatment of compound with NaOH yields sodium phenoxide and sodium by means of nucleophilic substitution reaction as follows
Solution: Option (ii) and (iv) are the answers. reason: Aldehydes and ketones and having at least one alpha-hydrogen undergo a reaction in the presence of dilute alkali as catalyst to beta-hydroxy...
Solution: Option (i) is the answer. Reason: From the above reaction carbonyl group is treated with Zn−Hg(Zinc Amalgum) and HCl
Solution: Option (ii) is the answer.
Solution: Option (iii) is the answer. Reason: This reaction is called as lodoform reaction.
Solution: Option (ii) is the answer. Reason:
Solution: Option (iv) is the answer. reason: Structure of A and the type of isomerism in the above reaction are Prop-1-en-2-ol, tautomerism respectively. Enol form tautomerises into keto...
Solution: Option (ii) is the answer. Reason: Benzaldhyde C6H5CHO on treatment with KOH yields the corresponding alcohol and acid. In this reaction, there is no alpha hydrogen atom present in...
Solution: Option (iv) is the answer. Reason: CH3CHO will not give Cannizzaro’s reaction because it contains a-hydrogen while other three compounds have no a-hydrogen. Hence, they will give...
Solution: Option (iii) is the answer. Reason: Aromatic aldehydes and ketones does not respond to Fehling's test. Sodium hydrogen sulphite,phenyl hydrazine, grignard reaction are common for carbonyl...
Solution: Option (ii) is the answer. Reason:
Solution: Option (iii) is the answer. Reason: The correct order of increasing acidic strength is Ethanol < Phenol < Acetic acid < Chloroacetic acid. Phenol is more acidic than ethanol...
Solution: Option (i) is the answer.
Solution: Option (ii) is the answer. Reason: Addition of water to but-1-yne in the presence of H2SO4 and HgSO4 gives 2-butaone. The addition takes place by markovnikoff's rule....
Solution: CH3CH2CH3 < CH3CH2NH2 < CH3CH2OH The dipole moment of CH3CH2OH is greater than that of CH3CH2NH2. CH3CH2CH3 has the least dipole moment among the three given compounds because it is...
Solution: The products formed in the reaction of aniline with bromine in a non-polar solvent such as CS2 are 4-Bromoaniline and 2-Bromoaniline where 4-Bromoaniline is the major product.
Solution: This reaction is carried out in a mild basic medium. This is an electrophilic substitution reaction. Aryldiazonium chloride reacts with aniline to form a yellow dye of p-Aminoazobenzene.
Solution: MeNH2 is a stronger base than MeOH because of the lower electronegativity and the presence of the lone pair of electrons on the nitrogen atom in MeNH2.
Solution: At high temperatures, benzene diazonium chloride is highly soluble in water, and at low temperatures, it is a very stable compound in water. Because it is unstable, it should be used as...
Solution: LiAlH4 and Sodium/Alcohol are the best reagents for converting nitrile to primary amine. The nitriles can be converted into a corresponding primary amine through reduction.
Solution: The NH2 group of aniline is acetylated before nitration to control the nitration reaction and the formation of tarry oxidation products and nitro derivatives. P-nitroaniline is the main...
Solution: Option (i) and (ii) are the answers. Reason:...
Solution: Option (i) and (ii) are the answers. Reason: In addition to the nitro derivatives, direct nitration of aniline produces tarry oxidation products. Furthermore, in a strongly acidic...
Solution: Option (i) and (iii) are the answers. Reason:
Solution: Option (i) and (ii) are the answers. Reason: Gabriel synthesis is used for the preparation of primary amines. Phthalimide on treatment with ethanolic potassium hydroxide forms potassium...
Solution: Option (i), (ii) and (iii) are the answers. Reason: Arenium ion involved in the bromination of aniline are as follows:
Solution: Option (A) and (B) is the answer. Reason:
Solution: Option (ii) and (iii) are the answers. Reason: Hypophosphorous acid (phosphinic acid) and ethanol, for example, reduce diazonium salts to arenes, which are then oxidised to phosphorous...
Solution: Option (i) and (ii) are the answers. Reason: Only RNC and CHCl3 are involved in carbylamine reaction.
Solution: Option (i), (ii), and (iii) are the answers. Reason: They are reducing agents.
Solution: Option (iii) and (iv) are the answers. Reason: Sandmeyer's reaction is used for the preparation of chlorobenzene and bromobenzene.
Solution: Option (iv) is the answer. Reason: In Hoffmann Bromide degradation as the word, suggest, the amide is reduced to an amine with 1- carbonless, so this is the method in which we don't get...
Solution: Option (ii) is the answer. Reason: The order of boiling points of isomeric amines is 1 amine > 2 amines > 3 amines. 3 amines have no intermolecular association because there are no H...
Solution; Option (iv) is the answer. Reason: Option (iv) is the strongest Bronsted base as there is no delocalization of lone pair of electron of the atom which is not possible in aniline and in...
Solution: Option (i) is the answer. Reason: NH3 is more basic than H2O, therefore NH2− (Conjugate base of weak acid NH3) is a stronger base than OH−.
Solution; Option (iv) is the answer. Reason: Option(iv)is the strongest Bronsted base as there is no delocalisation of lone pair of electron of N atom which is not possible in aniline and in...
Solution: Option (iii) is the answer. Reason: A Bronsted Lowry base is a proton acceptor or hydrogen ion acceptor. Amines have a stronger tendency to accept protons and are strong Bronsted bases....
Solution: Option (iv) is the answer. Reason: Diazonium cation is a weak electrophile and hence it reacts with electron-rich compounds containing electron-donating groups such as −OH, -$NH_2$ and...
Solution: Option (ii) is the answer. Reason: Best method for preparing primary aminos form alkyl halides without changing the number of carbon atoms in the chain is Gabriel synthesis. Because this...
Solution: Option (ii) is the answer. Reason: Diazonium salts in the presence of copper powder and halogen acid give aryl halide. Gattermann reaction is a variation of Sandmeyer reaction in which...
Solution: Option (i) is the answer Reason: When acid anhydrides react with primary amines, they produce amide. The H atom of the amino group is replaced with an acyl group in this nucleophilic...
Solution: Option (ii) is the answer. Reason: The reactivity of amines is proportional to their basicity. If the R group is, the order of basicity is secondary amine ...
Solution: Option (iii) is the answer. Reason: Reduction of nitro aryl compounds in presence of Fe and HCl gives aromatic primary amines.
and conc. 
,the species which initiates the reaction is __________. 
Solution: Option (iii) is the answer. Reason:
(ii) 
(iii) 
(iv) 
Solution: Option (ii) is the answer. Reason:
(ii) 
(iii) 
(iv) 
Solution: Option (iii) is the answer. Reason:
Solution: Option (iv) is the answer. Reason: Electron donating: group increases the basicity while electron-withdrawing group decreases the basicity of...
Solution: Option (ii) is the answer. Reason: Where the aryl amide is converted to arylamine in the presence of $Br_2$ and $NaOH$ .
Solution: Option (iv) is the answer. Reason:
+ RCHO followed by %H_2/Pt
H_3O+$/heatSolution: Option (iii) is the answer. Reason:
Solution: Option (iv) is the answer. Reason: Gabriel synthesis :The reaction is given to the image.Source of nitrogen atom is Gabriel synthesis is Potassium phthalamide.
group in the carbon chain, the reagent used as a source of nitrogen is ___________. Solution: Option (iii) is the answer. Reason:
Solution: Option (ii) is the answer. Reason: LiAlH4/ether reduces aryl nitro compounds to azo compounds 2C6H5NO2→LiAIH4C6H5N=N-C6H5
Solution: Option (iii) is the answer. Reason: C6H5CH2Br is best suited for this reaction through SN1 mechanism as the carbocation (C6H5CH2) formed is resonance...
Solution: Option (A) is the answer. Reason: Aniline is the weakest Bronsted base due to delocalization of lone pair of electron...
Solution: Option (iii) is the answer. Reason: Due to the electron releasing nature of the alkyl group, it (R) pushes electrons towards nitrogen and thus makes the uncharged electrons pair available...
is (i) Allylmethylamine (ii) 2-amino-4-pentene (iii) 4-aminopent-1-ene (iv) N-methylprop-2-en-1-amineSolution: Option (iv) is the answer. Reason: $CH_2=CHCH_2-NHCH_3$ N−methylprop−2−en−1−amine.
Solution: Option (ii) is the answer. Reason: Triethylamine is a 3° amine because of amonia in which each hydrogen atom is substituted by an methyl group.
(1) (2) (3) (4) Correct Answer: Option (4) Explanation: The given reaction in the fourth option does not yield an amine whereas the rest of the reactions...
1.Butan-1-ol 2.2-chlorobutane 3.Butan-2-ol 4.But-2-ene Correct Answer: 3.Butan-2-ol Explanation: Identification of Z - Butan-2-ol
(1) (2) (3) (4) Correct Answer: Option (3) Explanation:
1.Gluconic acid 2.Saccharic acid 3.n-Hexane 4.Glucoxime Correct Answer: 2. Saccharic acid Explanation: Identification of Y - Saccharic acid
1. 2.R-NH-OH 3.R-COOH 4.R-NH2 Correct Answer: 2.R-NH-OH Explanation: Identification of A - R-NH-OH
1.Terpenes occur in essential oils 2.Terpenes include vitamin A, E and K 3.Terpenes consist of isoprene units 4.Terpenes are saturated hydrocarbons Correct Answer: 4. Terpenes are saturated...
1.5 pi,14 sigma - bonds 2.3 pi,17 sigma - bonds 3.3 pi, 17 sigma - bonds 4.2 pi, sigma - bonds Correct Answer: 3.3 pi, 17 sigma - bonds Explanation: 3 pi, 17 sigma - bonds are...
253.5 pm 353.5 pm 465 pm 250 pm Solution: 353.5 pm $ For\text{ }a~FCC~or~~CCP~unit\text{ }cell,we\,have: $ $ 4r=\surd 2\times a $ $ \Rightarrow a=\frac{4r}{\surd 2}=353.5pm $
(1) (2) (3) (4) Correct Answer: (3) Explanation: Rosenmund reduction reaction -
Correct option: (3) Explanation: Because of the evolution of $SO_2$, not $CO_2$, blister copper has a blistered appearance. The Van Arkel method is used to obtain ultra-pure Titanium through vapor...
Correct option: (2) On ozonolysis, the structure in option B produces methane, as shown in the reaction above.
1.benzoic acid 2.picric acid 3.phthalic acid 4.benzene sulphonic acid Correct Answer: 2. picric acid Explanation: When carbolic acid is heated with concentrated nitric acid in presence of...
Fe2O3(s) + 3 CO(g) 2Fe(s) + 3CO2(g) o = -29.8 KJ and So =15JK-1. 1.29.8 J 2.100.0 J 3.298.0J 4.115.OJ Correct Answer: 4.115.OJ Explanation: The value of ∆S(total) at 298k is...
1.-6 2.+6 3.+3 4.Zero Correct Answer: 4. Zero Explanation: Zero is the oxidation number of carbons in glucose.
1.3.24 x 10-3Ms-1 2.3.24 x 10-6 Ms-1 3.6.48 x 10-6 Ms-1 4.2 x 10-3 Ms-1 Correct Answer: 3.6.48 x 10-6 Ms-1 Explanation: The rate of reaction when concentration of reactant is 2 x 10-3M is...
1.CaC2 2.CaCO3 3.CaCL2 4.CaO Correct Answer: 2.CaCO3 Explanation: Calcite crystals used in Nicol's prism are formed of CaCO3
1.in H2 molecule 15 molecular orbitals are shielded by electrons are shielded by electrons. 2.In H2 bond order is one. 3.In Li2 molecule 15 molecular orbitals are shielded by electrons. 4.In Li2...
1.1,3-Butadien 2.styrene 3.2-chlorobuta-1,3-diene 4.Isobutylene Correct Answer: 3.2-chlorobuta-1,3-diene Explanation: 2-chlorobuta-1,3-diene monomer is used in the manufacture of Neoprene...
1.unified mass 2.united mass 3.unique mass 4.universal mass Correct Answer: 1. unified mass Explanation: u stands for unified mass.
1.+4 2.+2 3.+5 4.+1 Correct Answer: 4. +1 Explanation: +1 is the lowest oxidation state possessed by phosphorus in its oxyacid
1.Au and Ag metals are deposited as anode mud. 2.Impurities as As and Sb are removed as volatile oxides. 3.Cu is obtained by auto reduction of Cu2O and CuS. 4.Iron is removed in the form of slag....
1.Ω cm-1 2.Ω-1 cm-1 3.Ω cm 4.Ω-1 cm Correct Answer: 2. Ω-1 cm-1 Explanation: Ω-1 cm-1 is the common unit of conductivity if the dimension is expressed in centimeter.
1.antibiotics 2.antacides 3.tranquilizers 4.analgesics Correct Answer: 3. tranquilizers Explanation: Blurring of vision is a side effect caused by the use of tranquillizers....
1.100.4oC 2.101.4OC 3.273OC 4.100OC Correct Answer: 2.101.4OC Explanation: 101.4OC is the boiling point of heavy water.
1.34 2.26 3.36 4.35 Correct Answer: 3.36 Explanation: 36 is effective atomic number of Fe in [Fe(CN)6]4-
1.Scandium 2.Cobalt 3.cpper 4.iron Correct Answer: 1. Scandium Explanation: Scandium is the element that has lowest density and is lightest.
1.Greater than 0.732 2.in between 0.414 to 0.732 3.in between 0.225 to 0.414 4.Less than 0.225 Correct Answer: 1.in between 0.414 to 0.732 Explanation: The value of radius ratio of ionic...
1.1.06 x 102 Ω-1cm2 mol-1 2.1.06 x 10-2 Ω-1cm2 mol-1 3.9.4 x 10-2 Ω-1cm2 mol-1 4.5.3 x 103 Ω-1cm2 mol-1 Correct Answer: 1.1.06 x 102 Ω-1cm2 mol-1 Explanation: The molar conductivity of 0.1 M...
1.popane and ethane 2.ethane and butane 3.propane and butane 4.ethane, propane and butane Correct Answer: 4. ethane, propane and butane Explanation: If a mixture of iodomethane and iodoethane...
1.Acetone 2.Benzophenone 3.Acetaldehyde 4.Accetophenone Correct Answer: 2. Benzophenone Explanation: Benzophenone is the carbonyl compound which does not undergoes aldol...
1.3.236 x 1022 2.6.180 x 1023 3.6.236 x 1020 4.3.236 x 1023 Correct Answer: 1.3.236 x 1022 Explanation: 3.236 x 1022 is the number of units cell in the 38.6g of noble having density 19.3gcm-1...
1.60% 2.40% 3.10% 4.20% Correct Answer: 2.40% Explanation: The percentage of formaldehyde in formalin is 40%.
1.Dimetapp 2.Cimetidine 3.Terfenadine 4.Ranitidine Correct Answer: 2.Cimetidine Explanation: Cimetidine contain –CN group.
1.[pt(NH3)6]4+ 2.[Co(en)3]3+ 3.[Cu(NH3)4]2+ 4.[Co (NH3)6]3+ Correct Answer: 2.[Co(en)3]3+ Explanation: [Co(en)3]3+does not have coordination number equal to number of...
1.21.5oC 2.30.98oC 3.13.1oC 4.48.1oC Correct Answer: 2.30.98o C Explanation: According to Andrews isothermals at 30.98oC the carbon dioxide gas starts to condense at 73...
1.4.3x 10-8 cm 2.3.72 x 10-8 cm 3.7.44 x 10-8 cm 4.5.26 x 10-8 cm Correct Answer: 1.4.3x 10-8 cm Explanation: Sodium crystallizes in bcc structure with radius 1.86 x 10-8cm. The edge length...
1.C + ½ O2 → CO 2.CaO + SiO2 → CaSiO3 3.Fe2O3 + 3 CO → 2 Fe + 3CO2 4.Fe2O3 + 3C → 2 Fe + 3 CO Correct Answer: 2. CaO + SiO2 → CaSiO3 Explanation: Reaction Involved - CaO + SiO2...
1.0.0133 M/s 2.0.023 M/s 3.0.004 M/s 4.0.032 M/s Correct Answer: 1.0.0133 M/s Explanation: In the given reaction , the rate of appearance of NH3 is 0.0133 M/s.
1.Butyl rubber 2.Buna-N 3.Buna-S 4.Neoprene rubber Correct Answer: 1.Butyl rubber Explanation: Butyl rubber is the polymer which is obtained by heating n moles of isobutylene with n moles of...
1.CO2(g) 2.N2(g) 3.NO2(g) 4.O2(g) Correct Answer: 4.O2(g) Explanation: Oxygen gas is bubbled through the brine solution during the preparation of sodium carbonate in Solvay's...
1.CO 2.Zn 3.W 4.Mo Correct Answer: 2.Zn Explanation: Zinc is a soft element when compared to the rest of the elements.
1.addition of 0.1 molal solution of NaCl 2.addition of 0.5 molal solution of Na2So4 3.addition of water 4.addition of 1 molal KI solution Correct Answer: 3. addition of water Explanation: By...
1.128 pm 2.134.5 pm 3.121pm 4.148pm Correct Answer: 1.128 pm Explanation: In the resonance hybrid of ozone molecule, O-O bond length is 128 pm.
2KCLO3(s) 2KCL(s) + 3 O(g) H0 = -78 KJ. if 33.6L of oxygen gas is liberated at S.T.P. (at mass K=39, CL= 35.5 g mol-1) 1.48.0 g 2.7.45 g 3.24.0 g 4.74.5 g Correct Answer: 4.74.5 g...
1.27.50 KJ mol-1 2.48.07 KJ mol-1 3.51.08 KJ mol-1 4.39.06 KJ mol-1 Correct Answer: 3.51.08 KJ mol-1 Explanation: Enthalpy of fusion of vaporization for water respectively are 6.01 Kj mol-1...
1.The three states of matter solid, liquid and gas may play role of either solute or solvent 2.the component of solution which constitute smaller part is called solute. 3.When water is solvent, the...
1.90o 2.109o281 3.120o 4.600 Correct Answer: 4.600 Explanation: The P-P-P bond angle in white phosphorus is 4.600
1.3.0 gL-1 urea and 17.19 gL-1 sucrose 2.0.3 gL-1 urea and 1.719 gL-1 sucrose 3.0.gL-1 urea and 1.719 gL-1 sucrose 4.0.3 gL-1 urea and 17.19 gL-1 sucrose Correct Answer: 1.3.0 gL-1 urea and...
1.Primary amine 2.tertiary amine 3.secondary amine 4.quatrnary ammonium salt Correct Answer: 1.Primary amine Explanation: When alkyl halide is boiled with large excess of alcoholic ammonia it...
1.iodomethane and ethanol 2.iodomethane and iodoethane 3.methanol and ethanol 4.methanol and iodoethane Correct Answer: 2.iodomethane and iodoethane Explanation: Methoxy ethane on reaction...
1.H2S2O4 2.H2SO3 3.H2S2O5 4.H2S2O2 Correct Answer: 4.H2S2O2 Explanation: H2S2O2 contains S=S linkage.
1.Isopentene ˃ n-pentane ˃ Neopentane 2.Neopentane ˃Isopentane ˃ n-pentane 3.n-pentane ˃ Isopentane ˃ Neopentane 4.Isopentane ˃ Neopentane ˃ n-pentane Correct Answer: 3.n-pentane ˃ Isopentane...
1.it changes the position of equilibrium. 2.it increases the rates of both forward and backward reaction equally in reversible reaction 3.it affects the energies of reactants and products of the...
Correct option (1) As the number of molecules per unit volume grows, so does the frequency of collisions.
Correct option (4) CO(g) + H2(g) = Synthetic gas or water gas Bicarbonates of Ca2+ and Mg2+...
Correct option (4) The methyl(phenyl) oxonium ion is formed when anisole reacts with protons from hydroiodic acid. The reaction is an SN2...
, peroxodisulphuric acid 
, pyrosulphuric acid 
, sulphurous acid 
, sulphuric acidThe correct option is (1) Diagrammatic representation of each compound is as follows,
![\[CH _{4}( g )+4 Cl _{2}( g ) \rightarrow CCl _{4}( l )+4 HCl ( g )\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-80c7d3f47e40e2ab7490771786cbcebe_l3.png "Rendered by QuickLaTeX.com")
to 
to Correct option: (2) The oxidation state carbon of methane is -4 which is the reactant and that on product side is carbon tetrachloride is +4.
Correct option (4) Acetone + ethanol deviates from Raoult's law in a positive way. H-bonding exists in pure ethanol, and adding acetone to it causes some H-bonds to break. The observed vapour...
of benzene is 
. The freezing point depression for the solution of molality 
m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places): 
(2) 
(3) 
(4) 
Correct option: (2) As we know that, we evaluate the value using the formula directly, $\begin{aligned} \Delta T _{ f }= i k _{ f } m \\ \Rightarrow \quad \Delta T _{ f } &=1 \times 5.12 \times...
or 
are trapped inside the crystal lattices of metals. 
and 
are not the same. 
is a stronger reducing agent than 
in water.Correct option (3) Explanation: Interstitial compounds are those formed when small atoms such as H, B, C, or N are trapped inside metal crystal lattices. Fact: On the basis of standard reduction...
$ 1.\,\,\Delta H-\Delta n=\Delta URT $ $ 2.\,\,\Delta H-\Delta U=\Delta nRT $ $ 3.\,\,\Delta H=\Delta nRT $ $ 4.\,\,\Delta H=\Delta U-RT $ Solution: $ 2.\,\,\Delta H-\Delta U=\Delta nRT $...
A. Gallium B. Bismuth C. Copper D. Zinc Solution: gallium The zone refining method is generally used to refine metalloids and ultra-pure metal is obtained. This is based on the idea that impurities...
against 
represents what term ? (A) 
(B) 
(C) 
(D) 
Correct option is C ( $-\mathrm{E}_{\mathrm{a}} / 2.303 \mathrm{R}$) Explanation: The Arrhenius equation is: $ \log _{10} \mathrm{k}=\log _{10} \mathrm{~A}-\frac{\mathrm{E}_{\mathrm{a}}}{2.303...
of ethanol, 
at at 
. Given : 
, molar mass of ethanol 
(A) 
(B) 
(C) 
(D) 
The correct option is B Explanation: The combustion of ethanol, involves the following reaction. $ C_{2} H_{5} O H(l)+3 O_{2}(g) \rightarrow 2 C O_{2}+3 H_{2} O $ Given, Mass of ethanol $=0.138...
Correct answer is A (Fluorine) Explanation: The reactions of alkanes with fluorine are explosive. Fluorine is a highly reactive element exhibiting an exothermic reaction when it reacts with...
Correct option is A Explanation: The tetrahedral geometry of the water molecule is deformed. The electrons in the O atom are divided into two lone pairs and two bond pairs. The sp 3 hybridisation of...
Correct option is B Explanation: Dextron is a biodegradable copolymer of glycolic acid and lactic acid that contains ester linkages.
(B) 
(C) 
Correct option is D Explanation: The group with the highest priority in the R, S configuration is -OH. The atomic number of O is larger than that of N and C. As a result, oxygen takes priority.
Correct option is A Explanation: Arenes undergo halogenation when exposed to chlorine in the presence of a Lewis acid catalyst, ferric chloride, or aluminium chloride, and in the absence of light....
and copper 
in their colourless compounds. (A) 
(B) 
(C) 
(D) 
Correct option is C $\mathrm{T} \mathrm{i}^{4+}, \mathrm{Cu}^{+}$ Explanation: The oxidation states of titanium $(\mathrm{Z}=22)$ and copper $(\mathrm{Z}=29)$ in their colourless compounds are...
D is the correct answer Explanation: The monosaccharide glyceraldehyde has only one asymmetric carbon atom in its molecule. An asterisk denotes an asymmetric carbon atom.
Correct option is A (Nitrogen) Explanation: Nitrogen does not exist as tetra atomic molecule. It exists as diatomic molecule $N_2$ that can be represented as N≡N.
(B) 
(C) 
(D) 
Correct option is (A) $M_{2}=\frac{K_{b} \cdot W_{2}}{\Delta T_{b} \cdot W_{1}}$ EXPLANATION: The correct relation between elevation of boiling point (ΔTb) and molar mass of solute (M2) is...
Correct option is B Balz-Schiemann reaction EXPLANATION: Balz-Schiemann reaction is used to prepare aryl fluorides from diazonium salts and fluoroboric acid. $ \mathrm{Ar}-\mathrm{N}_{2} \mathrm{X}...
Correct option is D Explanation: Bismuth is the only element that does not exhibit allotropy. There are two allotropes of nitrogen (solid). There are three types of antimony allotropes. There are...
Correct option is D Explanation: Conversion of hexane into benzene involves the reaction of dehydrogenation.
Correct option is D Explanation: A tranquillizer is a medicine that is used to treat anxiety, fear, tension, agitation, and other mental problems, with the goal of reducing anxiety and tension....
Correct option is B (Titanium) Explanation: The van Arkel process is used to obtain pure titanium. This procedure can also be used to obtain zirconium. Hall's procedure, Baeyer's process, or...
Correct option is C (Nomex) Explanation: Nomex is a synthetic fibre that is used to make clothing for firefighters. It's also utilised to make race car drivers' protective gear. Dynel is a synthetic...
(B) 
(C) 
(D) 
B $1.2 gmL^{-1}$ is the correct answer. Explanation: Sulphuric acid solution used as an electrolyte in a lead accumulator has a density of 1.2 gmL^-1. It is equivalent to 38 percent sulphuric acid...
(B) 
(C) 
(D) 
Correct option is B $\mathrm{NH}_{2} \mathrm{NH}_{2}$ Explanation: Excess of ammonia with sodium hypo chloride solution in the presence of glue or gelatine gives hydrazine $\left(\mathrm{NH}_{2}...
A is the correct answer. Explanation: Be has anomalous characteristics. This is due to beryllium's smaller atomic and ionic radii when compared to the other members of the group. It's also because...
Correct option is B Explanation: Salicyladehyde is formed when phenol interacts with chloroform in the presence of sodium hydroxide. The Reimer-Tiemann reaction is the name of the reaction.
Correct option is B Explanation: (i)The Hall's process is the most widely used industrial method for smelting aluminium. The process entails dissolving aluminium oxide in molten cryolite and...
and 
(B) Stream (C) 
and 
(D) Hydrogen peroxideCorrect Option is A Explanation: Water undergoes auto photolysis, which entails the breaking of chemical bonds as a result of the transmission of light energy to these bonds. It results in the...
Correct option is A (ZnS) Explanation: In ZnS, the Schottky defect does not exist. NaCl, KCl, and CsCl all have the Schottky defect. The Schottky defect occurs in solids where the cations and anions...
to 
at against a pressure of 101.325 KPa. Calculate the work done (A) 
(B) 
(C) -810.6kJ (D) 
Correct option is A $-201.6 \mathrm{~kJ}$ Explanation: $ \begin{array}{l} \Delta \mathrm{V}=\mathrm{V}_{2}-\mathrm{V}_{1}=2 \mathrm{~m}^{3}-\left(10 \mathrm{dm}^{3} \times 10^{-3} \mathrm{~m}^{3} /...