Chemical Thermodynamics Practice Questions
JEE · Chemistry · 1163 free MCQs with instant results and detailed explanations.
1163
Total
288
Easy
501
Medium
374
Hard
Start Practicing Chemical Thermodynamics
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Topics in Chemical Thermodynamics
First Law
189
Enthalpy
193
Hess's Law
84
Born-Haber Cycle
167
Entropy
179
Gibbs Free Energy
163
Spontaneity
188
Sample Questions from Chemical Thermodynamics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the First Law of Thermodynamics?
A.
Energy cannot be created or destroyed.
B.
Energy can be created but not destroyed.
C.
Energy is always conserved in chemical reactions.
D.
Energy can only be transformed from one form to another.
Show Answer & Explanation
Correct Answer: A
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed or transferred.
Q2
Easy
When a gas expands against a constant external pressure, which of the following statements is true?
A.
Work done by the gas is negative.
B.
Work done by the gas is zero.
C.
Work done on the gas is positive.
D.
Work done is equal to the change in internal energy.
Show Answer & Explanation
Correct Answer: A
In an expansion against an external pressure, the work done by the gas is considered negative as it loses energy.
Q3
Easy
Which of the following is NOT a state function?
A.
Internal energy
B.
Enthalpy
C.
Heat
D.
Entropy
Show Answer & Explanation
Correct Answer: C
Heat is not a state function as it depends on the path taken, while internal energy, enthalpy, and entropy are state functions.
Q4
Medium
What does the first law of thermodynamics state?
A.
Energy cannot be created or destroyed.
B.
Entropy of an isolated system increases over time.
C.
Heat can flow spontaneously from a colder body to a hotter body.
D.
Work is done only when there is a displacement.
Show Answer & Explanation
Correct Answer: A
The first law emphasizes the conservation of energy in any process.
Q5
Medium
In an isothermal process, the change in internal energy (ΔU) of an ideal gas is:
A.
Zero
B.
Equal to the heat added
C.
Equal to the work done
D.
Depends on pressure
Show Answer & Explanation
Correct Answer: A
For an ideal gas in an isothermal process, ΔU is zero since temperature is constant.
Q6
Medium
Which of the following statements is true about enthalpy (H)?
A.
Enthalpy is equivalent to internal energy.
B.
Enthalpy is always positive.
C.
Enthalpy accounts for pressure-volume work.
D.
Enthalpy does not change during a phase change.
Show Answer & Explanation
Correct Answer: C
Enthalpy includes internal energy and PV work, making it useful for constant pressure processes.
Q7
Medium
What happens to the internal energy of an ideal gas when it is compressed adiabatically?
A.
It decreases.
B.
It remains constant.
C.
It increases.
D.
It depends on the initial temperature.
Show Answer & Explanation
Correct Answer: C
In an adiabatic process, compression of gas increases its internal energy due to work done on it.
Q8
Hard
A certain amount of gas is contained in a piston-cylinder assembly. If the gas expands isothermally and reversibly, which of the following statements about the system is true?
A.
The internal energy remains constant.
B.
Work done on the system is positive.
C.
Heat absorbed is greater than work done.
D.
The pressure inside the cylinder increases.
Show Answer & Explanation
Correct Answer: A
For an isothermal process, the change in internal energy (ΔU) for an ideal gas is zero because temperature is constant. Thus, ΔU remains constant.
Q9
Hard
In a thermodynamic cycle, if the total work done by the system is 500 J and the total heat added to the system is 600 J, what is the change in internal energy during the complete cycle?
A.
100 J
B.
500 J
C.
600 J
D.
0 J
Show Answer & Explanation
Correct Answer: D
In a complete thermodynamic cycle, the change in internal energy is zero (ΔU = 0) regardless of the work done or heat added.
Q10
Hard
A gas expands from volume V1 to V2 isothermally. If it absorbs 1000 J of heat during this process, how much work is done by the gas if its internal energy change is zero?
A.
1000 J
B.
0 J
C.
500 J
D.
2000 J
Show Answer & Explanation
Correct Answer: A
In an isothermal process, the change in internal energy is zero, hence all the heat absorbed is converted into work done by the gas. Therefore, work done = 1000 J.
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Chemical Thermodynamics — JEE Chemistry Practice Questions Online
This page contains 1163 practice MCQs for the chapter Chemical Thermodynamics in JEE Chemistry. The questions are organized by difficulty — 288 easy, 501 medium, 374 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 7 topics, giving you comprehensive coverage of the entire chapter.