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Thermodynamics — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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10/14/6easy / medium / hard
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Sample questions from this chapter

In thermodynamics, what is the system?
  1. The selected part of the universe under observation ✓
  2. Everything outside the laboratory building
  3. Only the container wall around reacting substances
  4. The system and surroundings taken together
Answer: A. The observer defines a chosen region or matter as the system; the interacting remainder is its surroundings and the separating surface is the boundary.
Why not B: Surroundings are the portion outside the selected system that can interact with it, not merely a geographic exterior.
Why not C: The wall is the boundary; the chosen contents or region constitute the system.
Why not D: System plus surroundings is called the universe.
A system absorbs 50 kJ of heat and does 20 kJ of work on the surroundings. What is ΔU?
  1. +70 kJ
  2. -70 kJ
  3. +30 kJ ✓
  4. -30 kJ
Answer: C. Heat absorbed gives q = +50 kJ, while work done by the system gives w = −20 kJ. Thus ΔU = q + w = +30 kJ; the +70 trap reverses work sign.
Why not A: This treats work done by the system as positive and adds it to absorbed heat.
Why not B: This assigns negative signs to both the absorbed heat and the system's expansion work.
Why not D: This obtains the correct magnitude but reverses the sign of q + w.
One mole of ideal gas expands reversibly and isothermally at 298 K from 10.0 L to 20.0 L. What is w? Use R = 8.314 J K^-1 mol^-1.
  1. -1.72 kJ ✓
  2. +1.72 kJ
  3. -2.48 kJ
  4. -0.693 kJ
Answer: A. wrev = −nRT ln(Vf/Vi) = −(1)(8.314)(298)ln2 = −1717 J = −1.72 kJ. The gas does maximum expansion work on its surroundings.
Why not B: This uses the correct magnitude but assigns positive work to expansion rather than compression.
Why not C: This uses −nRT and omits the logarithmic volume ratio ln 2.
Why not D: This reports −ln 2 as kilojoules without multiplying by nRT.

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Every NCERT question in this chapter is solved, free: NCERT solutions — Thermodynamics →

Other NEET Chemistry chapters

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Questions

How many NEET questions are there on Thermodynamics?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.