Chemistry-First Law
NEET Chemistry First Law MCQ Question
Type: MCQ-numerical-Medium-Class 11
A system undergoes a change such that the work done on the system is -50 kJ and the heat absorbed by the system is 30 kJ. What is the change in internal energy (∆U) of the system?
A
∆U = -20 kJ
B
∆U = 20 kJ
C
∆U = -80 kJ
D
∆U = 80 kJ
Correct Answer
Option A
Detailed Explanation
According to the first law of thermodynamics, ∆U = q + w. Substituting the given values: ∆U = 30 kJ + (-50 kJ) = -20 kJ.
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