Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
When a gas expands at constant temperature, (1) the kinetic energy of the molecules increases (2) the kinetic energy of the molecules remains the same (3) the number of molecules of the gas increases (4) the pressure decreasesA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
When a gas expands at constant temperature, the kinetic energy of the molecules remains unchanged as\[\left( as\,KE=\frac{3}{2}nRT \right)\]but pressure decreases as\[\left( as\,p\propto \frac{1}{V} \right)\].
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