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Question

# Assertion :For an isothermal reversible process Q=−W i.e. work done by the system equals the heat absorbed by the system. Reason: Enthalpy change (△H) is zero for isothermal process.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

## The correct option is C Assertion is correct but Reason is incorrectIn an isothermal process change in internal energy (△E) is zero (as it is a function of temperature).∴ According to first law of thermodynamics ∵Q+W=△E. Hence Q=−W (if △E=0) If a system undergoes a change in which internal energy of the system remains constant (i.e. △E=0) then −W=Q. This means that work done by the system equal the heat absorbed by the system.Hence, assertion is correctWhen ΔE=0 (for isothermal process) ΔH need not to be zero as work done may or may not be zero.Hence, option C is correct

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