Chemistry-First Law
NEET Chemistry First Law MCQ Question
Type: MCQ-numerical-Hard-Class 11
For a system undergoing a change of state, if 50 kJ of heat is absorbed and 20 kJ of work is done on the system, what is the change in internal energy (∆U) of the system?
A
70 kJ
B
30 kJ
C
50 kJ
D
20 kJ
Correct Answer
Option A
Detailed Explanation
According to the first law of thermodynamics, ∆U = q + w. Here, q = 50 kJ (heat absorbed) and w = 20 kJ (work done on the system), so ∆U = 50 kJ + 20 kJ = 70 kJ.
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