Assertion :For an ideal gas in a cyclic process and in an isothermal process change in internal energy is zero. Reason: In both processes there is no change in temperature.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In an isothermal process, the temperature of the ideal gas remains constant.
In a cyclic process, the initial and final temperatures (states) are the same.
The internal energy of the gas is a function of temperature, hence if the temperature of initial and final states is the same. There is no change in internal energy.
Hence both assertion and reason are true and the reason is the correct explanation of the assertion.
Option A is correct.

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