Firstly, explaining Thermodynamics here: - Thermodynamics is the study of the transformations of energy. The chemical energy present in a particle is delivered in a different reaction. The laws of thermodynamics manage a naturally visible composition present in balance or changing starting with one condition of harmony then onto the next.
Class 11 Chemistry MCQ Questions of Thermodynamics with Answers for a speedy revision of the Chapter in this manner assisting you with improving Knowledge about the subjects. Solving the Class 11 Chemistry MCQ Questions of Thermodynamics with Answers can be of outrageous assistance as you will know about every one of the ideas and Concepts. These MCQ Questions are prepared by our subjects experts based on syllabus and exam pattern.
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Practice MCQ Questions for class 11 Chemistry Chapter-Wise
1. Third law of thermodynamics provides a method to evaluate which property?
(a) Absolute Energy
(b) Absolute Enthalpy
(c) Absolute Entropy
(d) Absolute Free Energy
2. One mole of which of the following has the highest entropy?
(a) Liquid Nitrogen
(b) Hydrogen Gas
(c) Mercury
(d) Diamond
3. The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
(a) Br2(g)
(b) Cl2(g)
(c) H2O(g)
(d) CH4(g)
4. In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?
(a) 850 kJ
(b) 600 kJ
(c) 350 kJ
(d) 250 kJ
5. Which of the following is true for the reaction? H2O(l) ⇔H2O(g) at 100° C and 1 atm pressure
(a) ∆S = 0
(b) ∆H = T ∆S
(c) ∆H = ∆U
(d) ∆H = 0
6. A system absorb 10 kJ of heat at constant volume and its temperature rises from 270 C to 370 C. The value of ∆ U is
(a) 100 kJ
(b) 10 kJ
(c) 0 kJ
(d) 1 kJ
7. In which of the following process, a maximum increase in entropy is observed?
(a) Dissolution of Salt in Water
(b) Condensation of Water
(c) Sublimation of Naphthalene
(d) Melting of Ice
8. Which thermodynamic function accounts automatically for enthalpy and entropy both?
(a) Helmholtz Free Energy (A)
(b) Internal Energy (E)
(c) Work Function
(d) Gibbs Free Energy
9. Based on the first law of thermodynamics, which one of the following is correct?
(a) For an isothermal process, q = +w
(b) For an isochoric process, ΔU = -q
(c) For an adiabatic process, ΔU = -w
(d) For a cyclic process, q = -w
10. The temperature of the system decreases in an .........
(a) Adiabatic Compression
(b) Isothermal Expansion
(c) Isothermal Compression
(d) Adiabatic Expansion
11. Which of the following salts will have maximum cooling effect when 0.5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt?
(a) KNO3 (∆H = 35.4 kJ mol-1)
(b) NaCl (∆H = 5.35 kJ mol-1)
(c) HBr (∆H = -83.3 kJ mol-1)
(d) KOH ( ∆H = -55.6 kJ mol-1)
12. Thermodynamics is not concerned about
(a) the rate at which a reaction proceeds
(b) the feasibility of a chemical reaction
(c) the extent to which a chemical reaction proceeds
(d) energy changes involved in a chemical reaction
13. Which of the following is closed system?
(a) Pressure cooker
(b) Rocket engine during propulsion
(c) Tea placed in a steel kettle
(d) Jet engine
14. Assertion: The part of the universe chosen for study of energy changes is called system.
Reason: whereas the rest of the universe is called surroundings.
(a) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
(b) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
(c) Assertion is correct but Reason is incorrect
(d) Both Assertion and Reason are incorrect
15. When the bond being formed are more than those being broken in a chemical reaction, then the ΔH will be
(a) Positive
(b) Negative
(c) Zero
(d) Both a and c
16. Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is :
(a) adiabatic
(b) isochoric
(c) isobaric
(d) isothermal
17. The efficiency of a Carnot engine depends upon:
(a) the temperature of the sink only
(b) the temperatures of the source and sink
(c) the volume of the cylinder of the engine
(d) the temperature of the source only
18. A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then -
(a) compressing the gas through adiabatic process will require more work to be done
(b) compressing the gas isothermally or adiabatically will require the same amount work
(c) which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas
(d) compressing the gas isothermally will require more work to be done
19. An ideal gas is compressed to half its initial volume by means of several process. Which of the process results in the maximum work done on the gas?
(a) Adiabatic
(b) Isobaric
(c) Isochoric
(d) Isothermal
20. If ΔU and ΔW represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?
(a) ΔU = −ΔW, in a adiabatic process
(b) ΔU = ΔW, in a isothermal process
(c) ΔU = ΔW, in a adiabatic process
(d) ΔU = −ΔW, in a isothermal process
21. The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is
(a) 8900 J
(b) 6400 J
(c) 5400 J
(d) 7900 J
22. At absolute zero, the entropy of a perfect crystal is zero. This is........... of thermodynamics.
(a) the first law
(b) second law
(c) third law
(d) none of these
23. Entropy decreases during:
(a) crystallization of sucrose from solution
(b) rusting of iron
(c) melting of ice
(d) vaporization of camphor
24. During the adiabatic process,
(a) pressure is maintained constant
(b) gas is isothermally expanded
(c) there is a perssure volume work
(d) The system changes heat with surrounding
25. Warming ammonium chloride with sodium hydroxide in a test tube is an example of:
(a) closed system
(b) Isolated system
(c) open system
(d) None of these