Assertion :Heavy water is used as amoderator 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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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$D_{2} O$ is used as moderator in nuclear reactor as it slows down the rate of remission of fast neutrons generated from nuclear reactions. $D_{2} O$ is made of an isotope of hydrogen.

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Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

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