Statement A: Density of nucleus is independent of its mass number
Statement B: Beryllium is used as a moderator in nuclear reactors

Both A and B are correct

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Both A and B are wrong

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A is correct,B is wrong

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A is wrong,B is correct

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Solution

The correct option is A Both A and B are correct
As, radius of nucleus $r \propto A^{\frac{1}{3}}$ where A is mass number. so, if we find the density of the nucleus is always constant and is independent of the mass number. And for statement B is pure fact that Beryllium is used as Moderators in nuclear reactors as they have good neutron absorbing capacities.

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(a) Assertion and Reason both are correct statement But reason does not explain Assertion.

(b) Assertion and Reason both are correct statement and Reason explains the Assertion.

(d) Assertion is correct statement and Reason is wrong statement.

(e) Assertion is wrong statement and reason is correct statement.

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