Chemistry-First Law
NEET Chemistry First Law MCQ Question
Type: MCQ-numerical-Medium-Class 11
A system undergoes a change of state where it absorbs 50 J of heat and performs 30 J of work on the surroundings. What is the change in internal energy (ΔU) of the system?
A
20 J
B
80 J
C
-20 J
D
50 J
Correct Answer
Option A
Detailed Explanation
According to the first law of thermodynamics, ΔU = q + w. Here, q = 50 J and w = -30 J (since work is done by the system), so ΔU = 50 + (-30) = 20 J.
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