Class 11 chemistry MCQs with answers are provided here for chapter 6 Thermodynamics. These MCQs are based on CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practicing these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.
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Class 11 Thermodynamics MCQs
1. A well stoppered thermos flask contains some ice cubes. This is an example of
(a) Closed system
(b) Open system
(c) Isolated system
(d) Non thermodynamics system
Ans: (c)
Solution: It is an isolated system
2. For the reaction C(s) + O2(g) → CO2(g)
(a) △H >△U
(b) △H < △U
(c) △H = △U
(d) None of these
Ans: (c)
Solution:Here △ng RT = 0 , because reactant and product contain same number of gaseous molecules. So that △H = △U + △ng RT ⇒ △H = △U
3. For an ideal gas, CV and CP are related as :
(a) CV – CP = R
(b) CV + CP = R
(c) CP – Cv = RT
(d) CP – Cv = R
Ans: (d) CP – Cv = R
Solution: For an ideal gas, CV and CP are related as CP – Cv = R
4. The least random state of the water system is:
(a) ice
(b) liquid water
(c) steam
(d) randomness is same
Ans: (a)
Solution: The least random state of the water system is ice.
5. Considering entropy(S) thermodynamic parameters the criteria for the spontaneity of any process is:
(a) △S system + △S surroundings > 0
(b) △S system – △S surroundings < 0
(c) △S system > 0
(d) △S surroundings > 0
Ans: (a)
Solution: The criteria for the spontaneity of any process is
△S system + △S surroundings > 0
6. The enthalpy change in a reaction does not depend upon
(a) the state of reactions and products
(b) the nature of the reactants and products
(c) different intermediate steps in the reaction
(d) initial and final enthalpy of the reaction
Ans: (c)
Solution: The enthalpy change is a state function so it doesn’t depend on different intermediate steps in the reaction.
7. The correct relationship between free energy change in a reaction and the corresponding equilibrium constant KC is
(a) -△G = RT lnKC
(b) △G0 = RT lnKC
(c) -△G0 = RT lnKC
(d) △G = RT lnKC
Ans: (c)
Solution : The relationship between free energy change in a reaction and the corresponding equilibrium constant KC is △G0 = – RT lnKC or -△G0 = RT lnKC
8. What is the entropy change (in JK-1 mol-1) when 1 mole of ice is converted into water at 0℃? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol-1 at 0℃)
(a) 20.13
(b) 2.013
(c) 2.198
(d) 21.98
Ans: (d)
Solution: The entropy change; ds = dqrev /T ⇒ ds = 6000J mol-1 / 273K
⇒ ds = 21.978JK-1 mol-1
9. If liquids A and B form an ideal solution
(a) the entropy of mixing is zero
(b) the free energy of mixing is zero
(c) the free energy as well as the entropy of mixing are zero
(d) the enthalpy of mixing is zero
Ans: (d)
Solution: If liquids A and B form an ideal solution the enthalpy of mixing is zero
10. When water is added to quick lime the reaction is
(a) Explosive
(b) endothermic
(c) exothermic
(d) photochemical
Ans: (c)
Solution: When water is added to quick lime the reaction is exothermic
CaO + H2O → Ca(OH)2 △H = -ve
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