Assertion :Heavy water is used as a moderator in nuclear reactors. Reason: Heavy water is made of an isotope of helium.

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 C Assertion is correct but Reason is incorrect
Heavy water $(D_{2} O)$ is made of an isotope of hydrogen, used as a moderator in nuclear reactors. Hence assertion is correct but reason is incorrect.

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Assertion :Heavy water is used as a moderator in nuclear reactors. Reason: Heavy water is made of an isotope of helium.

The correct option is C Assertion is correct but Reason is incorrectHeavy water (D2O) is made of an isotope of hydrogen, used as a moderator in nuclear reactors. Hence assertion is correct but reason is incorrect.

The correct option is C Assertion is correct but Reason is incorrect
Heavy water $(D_{2} O)$ is made of an isotope of hydrogen, used as a moderator in nuclear reactors. Hence assertion is correct but reason is incorrect.