STATEMENT-1 : The heat absorbed during isothermal expansion of an ideal gas against vacuum is zero.
STATEMENT-2 : In isothermal process, change in internal energy is always zero, irrespective of ideal or real gas.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

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Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

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Statement-1 is True, Statement-2 is False

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Statement-1 is False, Statement-2 is True

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Solution

The correct option is C Statement-1 is True, Statement-2 is False
During isothermal expansion against vacuum
W = 0 & $Δ E = 0$ Hence q = 0
Statement-2 is true for ideal gas only.

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