Class 11Chemistry Thermodynamics MCQs with Answers

Class 11 Chemistry Thermodynamics MCQs with Answers present a valuable resource for Sainik School aspirants, offering a targeted approach to mastering essential concepts. Tailored to the class 11 chemistry syllabus, these multiple-choice questions focus on the pivotal topic of thermodynamics. With clear and concise answers provided, students can efficiently self-assess, identifying strengths and areas for improvement. A solid understanding of thermodynamics is vital for success, and these MCQs ensure comprehensive comprehension of key principles.

As students prepare for Sainik School entrance exams, practicing these MCQs not only enhances exam readiness but also sharpens analytical and problem-solving skills. The content aligns with the broader goals of Sainik School education, emphasizing a holistic understanding of thermodynamics principles. This resource serves as a strategic tool, helping students build a strong foundation for future academic endeavors and meet the specific requirements of Sainik School examinations.

Q1. ΔfU⊖ of forma on of CH4 (g) at certain temperature is −393 kJ mol−1. The value of ΔfH⊖ is:

1. Zero
2. < Δ_fU^⊖
3. > Δ_fU^⊖
4. Equal to Δ_fU^⊖

Q2. The mathematical expression of first law of thermodynamics is:

1. ΔU = q
2. ΔU = W
3. ΔU = q + W
4. ΔU = W_ad

Q3. For the process to occur under adiabatic conditions, the correct condition is:

1. ΔT = 0
2. Δp = 0
3. q = 0
4. w = 0

Q4. For both reversible and irreversible expansion of an ideal gas, under isothermal condition,

1. ΔU = 0,ΔS_total ≠ 0

2. ΔU ≠ 0,ΔS_total = 0

3. ΔU = 0, ΔS_total ≠ 0

4. ΔU ≠ 0,ΔS_total ≠ 0

Q5. What will be the value of logarithm of equilibrium constant K if the standard free energy change of a reaction is

is ΔG^∘ = −115kJ at 298K will be:

1. 2.303

2. 13.83

3. 2.015

4. 20.15

Q6. The standard enthalpies of formation of CO (g), H O(l), and glucose(s) at 25°C are -400kJ/ mol, -300kJ/ mol and
-1300kJ/ mol^-1 respectively. The standard enthalpy of combustion per gram of glucose of 25°C is:

1. +2900kJ
2. -2900kJ
3. -16.11kJ
4. +16.11kJ

Q7. Maximum entropy will be in which of the following?

1. Ice.
2. Liquid water.
3. Snow.
4. Water vapour.

Q8. The sign of for a spontaneous and non-spontaneous process respectively are:

1. Positive and negative.
2. Negative and positive.
3. Zero and positive.
4. Positive and zero.

Q9. No work is done on the system, but q amount of heat is taken out from the system and given to the surrounding.
The change in internal energy of a system is:

1. ΔU = −q
2. ΔU = +q
3. ΔU = W_ad
4. ΔU = q − W

Q10. Thermodynamics mainly deals with,

1. Interrelation of various forms of energy and their transformation from one form to another.
2. Energy changes in the processes which depend only on initial and final states of the microscopic systems
   containing a few molecules.
3. How and at what rate these energy transformations are carried out.
4. The system in equilibrium state or moving from one equilibrium state to another equilibrium state.

Q11. Which one of the following reac on has ΔS^∘ greater than zero?

1. CaO + CO₂(g) ⇌ CaCO₃(s)
2. NaCl(aq) ⇌ NaCl(s)
3. NaNO₃(s) ⇌ Na⁺(aq) + NO⁻₃ (sq)
4. N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

Q12. Which of the following, is correct when decrease in entropy has been taken place?

1. Temperature of a crystalline solid is raised from 0K to 115K.
2. A liquid crystallises into a solid.
3. 2NaHCO₃(s) −Δ→ Na₂CO₃(s) + CO₂(g) + H₂O(g)
4. H₂(g) → 2H(g)

Q13. For the process, H O(l) → H O(g) at T = 100°C and 1 atm, the correct choice is:

1. ΔSSystem > 0 and ΔSSurr < 0

2. ΔSSystem > 0, ΔSSurr > 0

3.ΔSSystem < 0 and ΔSSurr > 0

4.ΔSSystem < 0, ΔSSurr < 0

Q14. Thermodynamics is not concerned about______.

1. Energy changes involved in a chemical reaction.
2. The extent to which a chemical reaction proceeds.
3. The rate at which a reaction proceeds.
4. The feasibility of a chemical reaction.

Q15. The spontaneity means, having the potential to proceed without the assistance of external agency. The processes
which occur spontaneously are,

1. flow of heat from colder to warmer body.
2. gas in a container contracting into one corner.
3. gas expanding to fill the available volume.
4. burning carbon in oxygen to give carbon dioxide.