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When a gas expands adiabatically

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No energy is required for expansion

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

Internal energy of the gas is used in doing work

Law of conservation of energy does not hold

answer is C.

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Detailed Solution

$ΔQ = ΔU + ΔW = 0 \Rightarrow ΔW = - ΔU$

if $ΔW$ is positive i.e., gas does work then $ΔU$ should be negative meaning internal energy is used in doing work.

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