Column 1 Column 2 (i) X-rays (a) ν = 100-0 104 Hz (ii) UV (b) ν = 1010Hz (iii) Long radio waves (c) ν = 1016 Hz (iv) Microwave (d) ν = 1018Hz Column 1 Column 2 (i) X-rays (d) ν = 1018Hz (ii) UV...
Match the following
Rule Principle (i) Hund’s Rule (a) No two electrons in an atom can have the same set of four quantum numbers. (ii) Aufbau Principle (b) Half-filled and filled orbitals have extra stability....
Match the quantum numbers with the information provided by these Quantum number Information provided
Column 1 Column 2 (i) Principal quantum number (a) orientation of the orbital (ii) Azimuthal quantum number (b) energy and size of orbital (iii) Magnetic quantum number (c) spin of an electron (iv)...
Match the following species with their corresponding ground state electronic configuration.
Atom / Ion Electronic configuration (i) Cu (a) 1s2 2s2 2p6 3s2 3p6 3d10 (ii) Cu2+ (b) 1s2 2s2 2p6 3s2 3p6 (iii) Zn2+ (c) 1s2 2s2 2p6 3s2 3p6 3d10 4s1 (iv) Cr3+ (d) 1s2 2s2 2p6 3s2 3p63d9 (e) 1s2...
The hydrogen atom has only one electron, so mutual repulsion between electrons is absent. However, in multielectron atoms mutual repulsion between the electrons is significant. How does this affect the energy of an electron in the orbitals of the same principal quantum number in multielectron atoms?
Hydrogen atom has only one electron, so the mutual repulsion between the electrons is non-existent. However, in multielectron atoms the interaction between electrons is important. This is because,...
A hypothetical electromagnetic wave is shown in Figure. Find out the wavelength of the radiation.
Distance between the two identical successive points in a wave is called the wavelength. Given, In the hypothetical wave, Wavelength, λ = 4 × 2.16 pm Hence, Wavelength, λ = 8.64 pm.
Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
(i) 1:2 (ii) 1:1 (iii) 1:3 (iv) 3:1 Correct Answer: (iii) 1:3 Explanation: Ratio of isotope abundance of Chlorine 37 to Chlorine 35 = A1:A2 Ratio of isotope abundance of Chlorine 37...
Orbital angular momentum depends on __________.
(i) l (ii) n and l (iii) n and m (iv) m and s Correct Answer: (i) l Explanation: Orbital angular momentum depends on the value of l which is referred to as the azimuthal quantum number.
A total number of orbitals associated with the third shell will be __________.
(i) 2 (ii) 4 (iii) 9 (iv) 3 Correct Answer: (iii) 9 Explanation: The total number of orbitals in nth shell = n2 Hence, the total number of orbitals associated with the third shell will...
Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons? (i) Pauli’s exclusion principle. (ii) Heisenberg’s uncertainty principle. (iii) Hund’s rule of maximum multiplicity. (iv) Aufbau principle.
Correct Answer: (ii) Heisenberg’s uncertainty principle. Explanation: The Heisenberg's uncertainty principle states that it is impossible to know the exact position and speed of an object...
The number of radial nodes for 3p orbital is __________.
(i) 3 (ii) 4 (iii) 2 (iv) 1 Correct Answer: (iv) 1 Explanation: Number of radial nodes for 3p orbital = 3−1−1 Number of radial nodes for 3p orbital = 3−2 Number of radial nodes for 3p...
Two atoms are said to be isobars if.
(i) they have the same atomic number but a different mass number. (ii) they have the same number of electrons but a different number of neutrons. (iii) they have the same number of neutrons but a...
Which of the following properties of an atom could be explained correctly by Thomson Model of an atom?
(i) Overall neutrality of atom. (ii) Spectra of a hydrogen atom. (iii) Position of electrons, protons and neutrons in an atom. (iv) Stability of atom. Correct Answer: (i) Overall...
Which of the following statements about the electron is incorrect?
(i) It is a negatively charged particle. (ii) The mass of an electron is equal to the mass of a neutron. (iii) It is a basic constituent of all atoms. (iv) It is a constituent of cathode rays....
Which of the following statement is not correct about the characteristics of cathode rays?
(i) They start from the cathode and move towards the anode. (ii) They travel in a straight line in the absence of an external electrical or magnetic field. (iii) Characteristics of cathode rays do...
The probability density plots of 1s and 2s orbitals are given in Figure:
The density of dots in a region represents the probability density of finding electrons in the region. Based on the above diagram which of the following statements is incorrect? (i) 1s and 2s...
Which of the following options does not represent ground state electronic configuration of an atom?
(i) 1s2 2s2 2p6 3s2 3p6 3d8 4s2 (ii) 1s2 2s2 2p6 3s2 3p6 3d9 4s2 (iii) 1s2 2s2 2p6 3s2 3p6 3d10 4s1 (iv) 1s2 2s2 2p6 3s2 3p6 3d5 4s1 Correct Answer: (ii) 1s2 2s2 2p6 3s2 3p6 3d9 4s2...
Which of the following conclusions could not be derived from Rutherford’s α -particle scattering experiment?
(i) Most of the space in the atom is empty. (ii) The radius of the atom is about 10–10 m while that of a nucleus is 10–15 m. (iii) Electrons move in a circular path of fixed energy called orbits....
A box contains some identical red coloured balls, labelled as A, each weighing 2 grams. Another box contains identical blue coloured balls, labelled as B, each weighing 5 grams. Consider the combinations AB, AB2, A2B and A2B3 and show that the law of multiple proportions is applicable.
AB ab2 A,B A2B3 Mass of A (in g) 2 2 4 415 Mass of B (in g) 5 10 5 According to the law of multiple proportions, Masses of B combines with a constant mass of A are 10g, 20g, 5g, 15g Simple...
Assertion (A): Combustion of 16 g of methane gives 18 g of water. Reason (R): In the combustion of methane, water is one of the products. (i) Both A and R are true but R is not the correct explanation of A. (ii) A is true but R is false. (iii) A is false but R is true. (iv) Both A and R are false.
Correct Answer: (iii) A is false but R is true Explanation: Combustion of 16 g of methane gives 36 g of water.
Assertion (A): Significant figures for 0.200 is 3 whereas for 200 it is 1. Reason (R): Zero at the end or right of a number are significantly provided they are not on the right side of the decimal point. (i) Both A and R are true and R is the correct explanation of A. (ii) Both A and R are true but R is not a correct explanation of A. (iii) A is true but R is false. (iv) Both A and R are false.
Correct Answer: (iii) A is true but R is false Explanation: Zero at the end of a number without the decimal point is not significantly based on the rate of accuracy.
The reactant which is entirely consumed in the reaction is known as limiting reagent. In the reaction 2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then (i) which is the limiting reagent? (ii) calculate the amount of C formed?
(i) The reactant B is the the limiting reagent. (ii) Calculation: Let us consider that the reactant B got completely consumed as it is the limiting reagent. 4 mol of B gives 3 mol of C 6 mol of B...
The density of 3 molal solutions of NaOH is 1.110 g mL–1. Calculate the molarity of the solution.
Calculation: 3 molal solution of NaOH = 3 moles of NaOH dissolved in water 3 mole of NaOH = 120g Density of solution = 1.110gmL-1 Volume = mass/density Volume = 1120g/1.110gmL-1 Volume =1.009L...
Calculate the average atomic mass of hydrogen using the following data :
Isotope % Natural abundance Molar mass 1H 99.985 1 2H 0.015 2 Calculation: Average atomic mass of Hydrogen \[=099.985\times 1+\frac{0.015\times 2}{100}\] ...
45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below:
2N2(g) + O2(g) → 2N2O(g) Which law is being obeyed in this experiment? Write the statement of the law? Answer: The Gay-Lussac’s law is used in the given reaction. The Gay-Lussac’s law states...
Which of the following terms is unitless?
(i) Molality (ii) Molarity (iii) Mole fraction (iv) Mass per cent Answer: Correct Answers: (iii) Mole fraction; (iv) Mass per cent Explanation: Unit of Molality - Molal or moles per kg Unit...
16 g of oxygen has the same number of molecules as in
(i) 16 g of CO (ii) 28 g of N2 (iii) 14 g of N2 (iv) 1.0 g of H2 Answer: Correct Answers: (iii) 14 g of N2; (iv) 1.0 g of H2 Explanation: The no. of molecules in N2 is 0.5 × 6.023 × 1023 The...
What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water? (i) 0.1 m (ii) 1 M (iii) 0.5 m (iv) 1 m
Correct Answer: (iv) 1 m Explanation: According to molality of a substance which is the number of mass of solute per mass of the solvent in liters, the molality of the solution containing 18.25 g of...
If the concentration of glucose (C6H12O6) in the blood is 0.9 g L-1, what will be the molarity of glucose in the blood? (i) 5 M (ii) 50 M (iii) 0.005 M (iv) 0.5 M
Correct Answer: (iii) 0.005 M Explanation: According to the molarity of a substance which is defined as the number of moles per volume of the solution in litres, the molarity of the glucose in blood...
The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms? (i) 4g He (ii) 46g Na (iii) 0.40g Ca (iv) 12g He
Correct Answer: (iv) 12g He Explanation: The number of atoms present in 4g of Helium – 1 NA The number of atoms present in 46g of Sodium - 2 NA The number of atoms present in 0.04g of Calcium – 0.01...
If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained? (i) 1.5 M (ii) 1.66 M (iii) 0.017 M (iv) 1.59 M
Correct Answer: (ii) 1.66 M Explanation: According to the Using M1V1= M2V2 formula, the value of M2 is 1.66 M.
What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL? (i) 4 mol L-1 (ii) 20 molL-1 (iii) 0.2 molL-1 (iv) 2molL-1
Correct Answer: (iii) 0.2 molL-1 Explanation: The Molarity is defined as the number of moles per volume of the solution in litres. Given, Mass = 5.85g Molar mass = 58.5 g/mol Volume of the solution...
A measured temperature on the Fahrenheit scale is 200 °F. What will this reading be on a Celsius scale? (i) 40 °C (ii) 94 °C (iii) 93.3 °C (iv) 30 °C
Correct Answer: (iii) 93.3 °C Explanation: According to the relationship between the temperature in Fahrenheit and Celsius scale, the temperature on Celsius scale is 93.3 °C.
Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. The correct reading of mass is 3.0 g. Based on given data, mark the correct option out of the following statements. Student Readings
(i) (ii) A 3.01 2.99 B 3.05 2.95 (i) Results of both the students are neither accurate nor precise. (ii) Results of student A are both precise and accurate. (iii) Results of student B are neither...
1.0 mol of a monoatomic ideal gas is extended from the state (1) to state (2) as displayed in Fig. 6.4. Ascertain the turn out accomplished for the development of gas from the state (1) to state (2) at 298 K.
solution: \[\begin{array}{*{35}{l}} W=\text{ }\text{ }2.303nRT\text{ }log\text{ }\left( p1/p2 \right) \\ ~ \\ =\text{ }\text{ }2.303\text{ }\times \text{ }1\text{ }mol\text{ }\times \text{...
Enthalpy graph for a specific response is given in Fig. Is it conceivable to choose the immediacy of a response from the given chart? Clarify.
solution: From the given enthalpy outline it tends to be said the adjustment of enthalpy ∆H is positive for the response, for example it will be endothermic. In any case, when goes to the suddenness...
Address the likely energy/enthalpy change in the accompanying cycles graphically. (a) Throwing a stone starting from the earliest stage rooftop.
In which of the cycles likely energy/enthalpy change is contributing variable to the immediacy?
solution: Among these two cycles, simultaneously or response (b) the expected energy/enthalpy change is contributing component to the immediacy.
How might you ascertain work done on an optimal gas in a pressure, when an adjustment of tension is completed in boundless advances?
solution: At the point when an optimal gas in a pressure, where the adjustment of tension is completed in boundless advances for example through a reversible interaction, the work done can be...
ideal gas encased in a chamber, when it is compacted by steady outer strain, pext in a solitary advance as displayed in Fig? Clarify graphically.
solution: From this chart we can get the be the work done on the ideal gas encased in the chamber in 1 stage: the region covered by P-V diagram (concealed locale) is the real worth of the...
An example of 1.0 mol of a monoatomic ideal gas is taken through a cyclic interaction of extension and pressure as displayed in Fig. What will be the worth of ∆H for the cycle in general?
solution: In the accompanying cyclic ( 1 → 2 →3 →1 ) measure the underlying and last point is something very similar (for example 1). Subsequently the enthalpy change or\[H=\text{ }0\]...
The strain volume work for an ideal gas can be determined by utilizing the articulation w= ʃPexdv. The work can likewise be determined from the pV–a plot by utilizing the region under the bend inside as far as possible. At the point when an ideal gas is compacted (a) reversibly or (b) irreversibly from volume Vi to Vf. pick the right alternative.
Arrangement: Alternative (ii) is the appropriate response. w (reversible) < w (irreversible) Region under the bend is more noteworthy in irreversible pressure than that of reversible...
An ideal gas is permitted to grow against a consistent strain of 2 bar from 10 L to 50 L in one stage. Compute the measure of work done by the gas. In the event that a similar development were done reversibly, will the work is done be higher or lower than the prior case?
solution: \[\begin{array}{*{35}{l}} Measure\text{ }of\text{ }work\text{ }done\text{ }=\text{ }-\text{ }pext\text{ }V \\ ~ \\ =\text{ }\text{ }2\text{ }bar\text{ }\times \text{ }\left(...
The enthalpy of response for the response :
What will be standard enthalpy of development of H2O (l)?
solution: For the given response : \[2H2\left( g \right)\text{ }+\text{ }O2\left( g \right)\text{ }\to 2H2O\left( l \right)\] the standard enthalpy of response is \[Hr\Theta \text{ }=\text{...
The enthalpy of vapourisation of CCl4 is 30.5 kJ mol–1. Compute the warmth needed for the vapourisation of 284 g of CCl4 at steady tension.
solution: The enthalpy of vapourisation is given \[\begin{array}{*{35}{l}} for\text{ }1\text{ }mole\text{ }of\text{ }CCl4\text{ }=\text{ }30.5\text{ }kJ\text{ }mol1 \\ ~ \\...
The net enthalpy change of a response is the measure of energy needed to break every one of the bonds in reactant atoms less the measure of energy needed to shape every one of the bonds in the item particles. What will be the enthalpy change for the accompanying response?
Considering that Bond energy of H2, Br2 and HBr is 435 kJ mol–1, 192 kJ mol–1 and 368 kJ mol–1 separately.
solution: For the response \[H2\left( g \right)\text{ }+\text{ }Br2\left( g \right)\text{ }\to 2HBr\left( g \right)\] \[\begin{array}{*{35}{l}} Enthalpy\text{ }change \\ ~ \\ =\text{...
On the off chance that the burning of 1g of graphite produces 20.7 kJ of warmth, what will be molar enthalpy change? Offer the meaning of the hint too.
solution: The warmth of ignition ∆Hc of graphite (for example carbon) is given as \[=\text{ }20.7\text{ }kJ\] for 1g of graphite (C). \[1\text{ }mole\text{ }of\text{ }Carbon\text{...
The contrast among CP and CV can be inferred utilizing the experimental connection
. Work out the distinction among CP and CV for 10 moles of an optimal gas.
solution: For an optimal gas, the distinction between these two \[is\text{ }CP\text{ }\text{ }CV\text{ }=\text{ }nR,\] the all inclusive gas consistent and \[where\text{ }n=\text{ }no.\text{...
Warmth limit (Cp) is a broad property yet explicit warmth (c) is an escalated property. What will be the connection between Cpand c for 1 mol of water?
solution: \[\begin{array}{*{35}{l}} For\text{ }water,\text{ }molar\text{ }warmth\text{ }limit\text{ }=\text{ }18\text{ }x\text{ }Specific\text{ }warmth\text{ }or \\ ~ \\ Cp~=\text{...
Development of gas in a vacuum is called free extension. Ascertain the work is done and the adjustment of inner energy when 1 liter of an ideal gas grows isothermally into a vacuum until its complete volume is 5 liter?
solution: Work done in vacuum is determined by : \[\begin{array}{*{35}{l}} -\text{ }w\text{ }=\text{ }Text\text{ }\left( Vinitial\text{ }\text{ }Vfinal\text{ } \right) \\ ~ \\...
Despite the fact that warmth is a way work yet warms consumed by the framework under certain particular conditions is free of way. What are those conditions? Clarify.
solution: Warmth is free of the way under 2 conditions: At the point when the volume of the framework is kept steady By first law of thermodynamics: ...
Foresee the adjustment of inward energy for a secluded framework at steady volume.
solution: For a disengaged framework \[q=0\text{ }and\text{ }w=0\] What's more, as indicated by first law of thermodynamics: \[U=\text{ }q\text{ }+\text{ }w\text{ }\left(...
Which amount out of ΔrG and ΔrGΘwill be zero at harmony?
solution: Gibbs energy for a response in which all reactants and items are in standard state. ΔrG° is identified with the harmony consistent of the response as follows ...
The molar enthalpy of vapourisation of CH3)2CO is not exactly that of water. Why?
solution: Water has solid hydrogen bonds and the high extremity likewise accumulates in coming about it to bubble at higher temperatures. Thus water has a higher molar enthalpy than CH3)2CO....
Distinguish the state capacities and way works out of the accompanying : enthalpy, entropy, heat, temperature, work, free energy.
solution: State capacities: enthalpy, entropy, temperature and free energy. Way works: Heat and work
The standard molar entropy of H2O (l ) is 70 J K–1 mol–1. Will the standard molar entropy of H2O(s) be more, or under 70 J K–1 mol–1?
solution: The standard molar entropy of H20 (1) is 70 J K-1 mol-1. The strong type of H20 is ice. In ice, atoms of H20 are less irregular than in fluid water. In this way, molar entropy of...
As warm harmony complies with the zeroth law of thermodynamics, temperature of framework and environmental elements will be a similar when they are in warm balance.
solution: For the given response \[N2O4\text{ }\left( g \right)\leftrightharpoons 2NO2\text{ }\left( g \right)\text{ }the\text{ }worth\text{ }of\text{ }Kp\text{ }=\text{ }0.98.\]...
Expansion in enthalpy of the environmental elements is equivalent to the lessening in enthalpy of the framework. Will the temperature of the framework and environmental elements be a similar when they are in warm balance?
solution: As warm balance submits to the zeroth law of thermodynamics, temperature of framework and environmental factors will be a similar when they are in warm balance.
The warmth affects a framework and temperature is the proportion of normal tumultuous movement of particles in the framework. Compose the numerical connection which relates these three boundaries.
solution: The numerical connection which relates these three boundaries is \[\Delta S\text{ }=\text{ }qrev/T\] where ΔS is the adjustment of entropy and T represents...
. Utilize the accompanying information to ascertain Δlattice Hθfor NaBr.
solution: Sublimation of the metal(ΔsubHΘ) →Ionization of the metal (ΔiHΘ) →Dissociation of the non-metal (ΔdissHΘ) →Gain of electrons by the non-metal(ΔegHΘ) \[\Delta f\text{ }H\theta...
The enthalpy of atomisation for the response
. What is the bond energy of the C–H bond?
solution: For 1 C-H bond, the bond energy will be equivalent to 1/4 that of the enthalpy of atomisation \[=\text{ }\left( 1665/4 \right)\text{ }=\text{ }416.25\text{ }kJ\text{...
. Enthalpy is a broad property. As a rule, if the enthalpy of a general response A→B along one course is Δr H and Δr H1, ΔrH2, ΔrH3 … .. address enthalpies of middle responses prompting item B. What will be the connection between ΔrH for generally speaking response and ΔrH1, ΔrH2… .. and so forth for moderate responses.
solution: For the response, A→B the development of B goes through a few middle of the road responses with various enthalpy esteems Δr H1, ΔrH2, ΔrH3… .., and the general enthalpy change is Δr...
. The worth of
. Compute the enthalpy change for the accompanying response :
solution: Enthalpy change of a response is determined as : Σbond enthalpy of reactants-Σbond enthalpy of items for the deterioration \[\begin{array}{*{35}{l}} 2NH3\left( g...
Standard molar enthalpy of arrangement, Δf Hθis simply a unique instance of enthalpy of response, Δr Hθ. Is the Δr Hθfor the accompanying response same as Δf Hθ? Offer the justification behind your response.
solution: The given response \[CaO\left( s \right)\text{ }+\text{ }CO2\left( g \right)\text{ }\to CaCO3\left( s \right)\] is demonstrating that it is happening in the standard type of 1 mole...
. One mole of CH3)2CO requires less warmth to disintegrate than 1 mol of water. Which of the two fluids has a higher enthalpy of vapourisation?
solution: Among the two fluids, water has a higher enthalpy of vapourisation (burning-through higher warmth energy). Thusly, ∆Hvapourisation (water) > ∆Hvapourisation...
18.0 g of water totally vapourises at 100°C and 1 bar pressure and the enthalpy change in the process is 40.79 kJ mol–1. What will be the enthalpy change for vapourising two moles of water under similar conditions? What is the standard enthalpy of vapourisation for water?
solution: Enthalpy change of vapourisation for \[1\text{ }mole\text{ }=\text{ }40.79\text{ }kJ\text{ }mol1\] enthalpy change of vapourisation for \[2\text{ }moles\text{ }of\text{ }water\text{...
. Think about the accompanying response among zinc and oxygen and pick the right alternatives out of the choices given underneath :
(i) The enthalpy of two moles of ZnO is not exactly the absolute enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ. (ii) The enthalpy of two moles of ZnO is more than the absolute enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ. (iii) 693.8 kJ mol–1 energy is advanced in the response. (iv) 693.8 kJ mol–1 energy is caught up in the response.
solution: Choice (I) and (iii) are the appropriate responses
. For an optimal gas, crafted by reversible extension under isothermal condition can be determined by utilizing the articulation
An example containing 1.0 mol of an ideal gas is extended isothermally and reversibly to multiple times of its unique volume, in two separate tests. The extension is completed at 300 K and 600 K separately. Pick the right alternative. (I) Work done at 600 K is multiple times the work done at 300 K. (ii) Work done at 300 K is double the work done at 600 K. (iii) Work done at 600 K is double the work done at 300 K. (iv) ∆U = 0 in the two cases.
solution: Alternative (iii) and (iv) are the appropriate responses. work done at 600 K is double the work done at 300 K. Since each case includes isothermal extension of an optimal gas, there...
The immediacy implies, having the capacity to continue without the help of an outer organization. The cycles which happen immediately are (I) stream of warmth from colder to hotter body. (ii) gas in a compartment contracting into one corner. (iii) gas extending to fill the accessible volume. (iv) consuming carbon in oxygen to give carbon dioxide.
solution: Alternative (iii) and (iv) are the appropriate responses. Gas grows or diffuses in accessible space suddenly, e.g., spillage of cooking gas gives smell of ethyl mercaptan...
In an exothermic response, heat is advanced, and the framework loses warmth to the encompassing. For such a framework (I) qp will be negative (ii) ∆rH will be negative (iii) qp will be positive (iv) ∆rH will be positive
solution: Choice (I) and (ii) are the appropriate responses. For an exothermic response\[,\text{ }qp~=\text{ }-\text{ }ve,\text{ }\gamma H\text{ }=\text{ }-\text{ }ve\]
. Thermodynamics essentially manages (I) interrelation of different types of energy and their change from one structure to another. (ii) energy changes in the cycles which rely just upon starting and last conditions of the minute frameworks containing a couple of particles. (iii) how and at what rate these energy changes are done. (iv) the framework in harmony state or moving from one balance state to another harmony state.
solution: Alternative (I) and (iv) are the appropriate responses. Thermodynamics manages interrelation of different types of energy and their change into one another. It additionally manages...
. Which of coming up next isn’t right? (I) ∆G is zero for a reversible response (ii) ∆G is positive for an unconstrained response (iii) ∆G is negative for an unconstrained response (iv) ∆G is positive for a non-unconstrained response
solution: Alternative (ii) is the appropriate response. ∆G gives a basis for suddenness at consistent strain and temperature. (I) If ∆G is negative (< 0). the cycle is...
. Enthalpy of sublimation of a substance is equivalent to (I) enthalpy of combination + enthalpy of vapourisation (ii) enthalpy of combination (iii) enthalpy of vapourisation (iv) double the enthalpy of vapourisation
solution: Choice (I) is the appropriate response. Enthalpy of sublimation of a substance is equivalent to enthalpy of combination + enthalpy of vapourisation. Sublimation is immediate...
The enthalpies of components in their standard states are taken as nothing. The enthalpy of arrangement of a compound (I) is consistently negative (ii) is consistently sure (iii) possibly certain or negative (iv) is rarely negative
solution: Choice (iii) is the appropriate response. Warmth of arrangement of a compound might be positive or negative.
. Consider the responses given beneath. Based on these responses discover which of the arithmetical relations given in choices (I) to (iv) is right?
solution: Choice (iii) is the appropriate response. x > y because same bonds are formed in reactions (i) and (ii) but bonds between reactant molecules are broken only in reaction...
Based on thermochemical conditions (a), (b) and (c), discover which of the logarithmic connections given in alternatives (I) to (iv) is right.
solution: Choice (iii) is the appropriate response. \[\begin{array}{*{35}{l}} \left( a \right)\text{ }C\text{ }\left( graphite \right)\text{ }+\text{ }O2\text{ }\left( g \right)\text{ }\to...
The entropy change can be determined by utilizing the articulation
At the point when water freezes in a glass container, pick the right assertion among the accompanying : (I) ∆S (framework) diminishes however ∆S (environmental factors) stays as before. (ii) ∆S (framework) increments yet ∆S (environmental elements) diminishes. (iii) ∆S (framework) diminishes yet ∆S (environmental elements) increments. (iv) ∆S (framework) diminishes and ∆S (environmental factors) likewise diminishes.
solution: Alternative (iii) is the appropriate response. During the method involved with freezing energy is released,which is consumed by the environmental factors. Therefore,the entropy off...
Hydrogen bonds are formed in many compounds e.g., H2O, HF, NH3. The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of the above compounds is : (i) HF > H2O > NH3 (ii) H2O > HF > NH3 (iii) NH3 > HF > H2O (iv) NH3 > H2O > HF
Solution: Option (ii) is the answer.
The types of hybrid orbitals of nitrogen in NO2+, NO3- and NH4+respectively are expected to be
(i) sp, sp3 and sp2
(ii) sp, sp2 and sp3
(iii) sp2, sp and sp3
(iv) sp2, sp3 and sp
Solution: Option (ii) is the answer. The hybridisation of each molecule gives us an idea about the hybrid orbitals.
In an adiabatic interaction, no exchange of warmth happens among framework and environmental elements. Pick the right choice with the expectation of complimentary extension of an optimal gas under adiabatic condition from the accompanying.
solution: Choice (iii) is the appropriate response. With the expectation of complimentary extension w = 0 For adiabatic cycle q = 0 From first law of thermodynamics, ...
. ∆fUᶱ of arrangement of CH4 (g) at certain temperature is – 393 kJ mol–1. The worth of ∆ fHᶱ is (I) zero (ii) < ∆f Uᶱ (iii) > ∆f Uᶱ (iv) equivalent to ∆f Uᶱ
solution: Choice (ii) is the appropriate response.
During complete burning of one mole of butane, 2658 kJ of warmth is delivered. The thermochemical response for above change is
solution: Choice (iii) is the appropriate response. Exothermic reaction for combustion of one mole of butane is represented as \[\left( iii \right)\text{ }C4H10\left( g \right)\text{...
. The volume of gas is decreased to half from its unique volume. The particular warmth will be ______. (I) decrease to half (ii) be multiplied (iii) stay consistent (iv) increment multiple times
solution: Alternative (iii) is the appropriate response. The particular warmth of a substance is the warmth needed to raise the temperature of 1 gram of a substance by one degree (1 K or 1...
The condition of a gas can be portrayed by citing the relationship between___. (I) pressure, volume, temperature (ii) temperature, sum, pressure (iii) the sum, volume, temperature (iv) pressure, volume, temperature, sum
solution: Alternative (iv) is the appropriate response. Condition of a framework can be portrayed by state capacities or state factors which are pressure, volume, temperature and measure of...
Which of the accompanying assertions is right? (I) The presence of responding species in a covered measuring utencil is an illustration of an open framework. (ii) There is a trade of energy just as a matter between the framework also, the environmental elements in a shut framework. (iii) The presence of reactants in a shut vessel made down of copper is an illustration of a shut framework. (iv) The presence of reactants in a canteen jar or some other shut protected vessel is an illustration of a shut framework.
solution: Alternative (iii) is the appropriate response. For a shut vessel made down of copper, regardless of can be traded between the framework and the environmental elements however energy trade...
Thermodynamics isn’t worried about______. (I) energy changes associated with a substance response. (ii) the degree to which a substance response continues. (iii) the rate at which a response continues. (iv) the practicality of a synthetic response.
solution: Choice (iii) is the appropriate response. This is because Thermodynamics informs us concerning the practicality, energy changes and degree of compound response. It doesn't informs us...
Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs. (i) [NF3 and BF3] (ii) [BF4- and NH4+] (iii) [BCl3 and BrCl3] (iv) [NH3 and NO3-]
From a structural standpoint, we can see that, NF3 is pyramidal whereas BF3 is planar triangular. BF4- and NH4+ ions are tetrahedral in structure. BCl3 is triangular planar and BrCl3 is...
Among halogens, the correct order of the amount of energy released in electron gain (electron gain enthalpy) is:
(i) F > Cl > Br > I
(ii) F < Cl < Br < I
(iii) F < Cl > Br > I
(iv) F < Cl < Br < I
Option (iii) is the answer. The amount of energy released when an electron is added to an isolated gaseous atom is known as electron gain enthalpy. The electron gain enthalpy of F is less...
The electronic configuration of gadolinium (Atomic number 64) is
Option (iii) is the answer. The electronic configuration of gandolium is [Xe] 4f7 5d1 6s2
Why do we need to classify drugs in different ways?
The following are the reasons for the classification of drugs: (i) The pharmacological effect is based on the following: This definition is beneficial to physicians. It offers a wide range of...
What is shape-selective catalysis?
Shape-selective catalysis is a catalytic reaction that depends on the product molecules, the size of the reactants, and the pore structure and size of the catalyst. For example, a catalytic process...
Write the differences between multimolecular and macromolecular colloids. Give one example of each. How are associated colloids different from these colloids.
(I) The colloidal particles in multi-molecular colloids are an assemblage of atoms or tiny molecules having a diameter of less than 1 nm. The molecules in the aggregate are held together by Van der...
What is an adsorption isotherm? Describe Freundlich’s adsorption isotherm.
The plot of the amount of adsorption (x/m) against the pressure of the gas (P) at constant temperature is known as the adsorption isotherm (T). Three cases arise from the graph which are as follow...