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Q.

When a gas expands adiabatically

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a

No energy is required for expansion

b

Energy is required and it comes from the wall of the container of the gas

c

Internal energy of the gas is used in doing work

d

Law of conservation of energy does not hold

answer is C.

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Detailed Solution

ΔQ=ΔU+ΔW=0⇒ΔW=−ΔUif  ΔW is positive i.e., gas does work then ΔU should be negative meaning internal energy is used in doing work.
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