Q79 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Thermodynamics – General · Marks: 2 · Difficulty: Medium

The minimum work required by an engine to transfer 5 J of heat from a reservoir at 100 K to one at 300 K is
(a)5 J
(b)10 J
(c)15 J
(d)20 J
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Reversible refrigerator: W = q_c(T_h/T_c − 1) = 5 × (300/100 − 1) = 10 J.

Study loop for Thermodynamics

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