AIPMT MAINS2009Chemistry-Thermodynamics
AIPMT MAINS 2009 Chemistry First Law of Thermodynamics MCQ Question
Type: MCQ-numerical-Medium-Class 11
The internal energy change in a system that has absorbed 2 Kcals of heat and done 500 J of work is:
A
6400 J
B
5400 J
C
7900 J
D
8900 J
Correct Answer
Option B
Detailed Explanation
Using the first law of thermodynamics, ΔU = Q - W. Here, Q = 2 Kcal = 8400 J, W = 500 J, so ΔU = 8400 J - 500 J = 7900 J.
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