NCERT MCQ CLASS-11 CHAPTER-12 | PHYSICS NCERT MCQ | THEMODYNAMICS | EDUGROWN

In This Post we are  providing Chapter-12 Thermodynamics NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON THERMODYNAMICS

Question 1.
One gram of sample of NH₄NO₃ is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K. The heat capacity of the system is 1.23 kj/deg. What is the molar heat of decomposition of NH₄NO₃?
(a) -7.53 kj/mol
(b) -398.1 kj mol^-1
(c) -16.1 kj/mol
(d) -602 kj/mol.

Answer: (d) -602 kj/mol.

Question 2.
AHr of graphite is 0.23 kj/mol and ∆H_f for diamond is 1.896 kj mol^-1, ∆H_transition from graphite to diamond is
(a) 1.66 kj/mol
(b) 2.1 kj/mol
(c) 2.33 kj/mol
(d) 1.5 kj/mol

Answer: (a) 1.66 kj/mol

Question 3.
The bond energies of C-C, C=C; H-H and C-H linkages are 350, 600, 400 and 410 kj per mole respectively. The heat of hydrogenation of ethylene is
(a) -170 kj mol^-1
(b) -260 kj mol^-1
(c) 400 kj mol^-1
(d) -450 kj mol^-1

Answer: (a) -170 kj mol^-1

Question 4.
Which of the following reaction defines ∆H0f?
(a) C(Diamond) + O₂(g) → CO₂(g)
(b) 12 H₂(g) + 12 F₂(g) → HF(g)
(c) N₂(g) + 3H₂(g) → 2NH₃(g)
(d) CO(g) + 12 O₂(g) → CO₂(g)

Answer: (b) 12 H₂(g) + 12 F₂(g) → HF(g)

Question 5.
One mole of a hon-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change in internal energy, ∆U = 30.0 L atm. The change in enthalpy (∆H) of the process in L atm is
(a) 44.0
(b) 42.3
(c) 44.0
(d) not defined because pressure is not constant.

Answer: (c) 44.0

Question 6.
Which one of the following statement is false?
(a) Work is a state function
(b) Temperature is a state function
(c) Change in the state is completely defined when the initial final states are specified
(d) Work appears at the boundary of the system

Answer: (a) Work is a state function

Question 7.
Molar heat capacity of water in equilibrium with ice at constant pressure is
(a) zero
(b) infinity
(c) 40.45 kj K^-1 mol^-1
(d) 75.48 JK^-1 mol^-1

Answer: (b) infinity

Question 8.
For the reaction C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(I) at constant temperature ∆H – ∆E is
(a) + RT
(b) – 3RT
(c) + 3RT
(d) -RT

Answer: (b) – 3RT

Question 9.
For which one of the following equations AH_reaction equals ∆H0f for the product?
(a) N₂(g) + O₃(g) → N₂O₃(g)
(b) CH₄(g) + 2Cl₂(g) → CH₂Cl₂(l) + 2HCl(g)
(c) Xe(g) + 2F₂(g) → XeF₄(g)
(d) 2C(g) + O₂(g) → 2CO₂(g)

Answer: (c) Xe(g) + 2F₂(g) → XeF₄(g)

Question 10.
Enthalpy of CH₄ + 12 O₂ → CH₃OH is negative.
If enthalpy of combustion of CH₄ and CH₃OH are x and y respectively then which reaction is correct?
(a) x > y
(b) x < y
(c) x = y
(d) x ≥ y

Answer: (b) x < y

Question 11.
The heat required to raise the temperature of a body by 1 K is called
(a) Specific heat
(b) Thermal capacity
(c) Water equivalent
(d) Molar heat capacity

Answer: (b) Thermal capacity

Question 12.
In a reaction involving only solids and liquids, which of the following is true?
(a) ∆H < ∆E (b) ∆H = ∆E (c) ∆H > ∆E
(d) ∆H = ∆E + RT∆₁₁

Answer: (b) ∆H = ∆E

Question 13.
In which of the following process, the process is always non-feasible?
(a) ∆H > 0, ∆S > 0
(b) ∆H < 0, ∆S > 0
(c) ∆H > 0, ∆S < 0
(d) ∆H < 0, ∆S < 0

Answer: (c) ∆H > 0, ∆S < 0

Question 14.
Internal energy does not include
(a) Nuclear energy
(b) Vibrational energy
(c) Rotational energy
(d) Energy of gravitational pull

Answer: (d) Energy of gravitational pull

Question 15.
Which of the following reactions is endothermic?
(a) N₂ + O₂ → 2NO
(b) H₂ + Cl₂ → 2HCl
(c) H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₁₁O
(d) None of these

Answer: (a) N₂ + O₂ → 2NO

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