Assertion :Half life of a radioactive isotope is the time required to decrease its mass number by half. Reason: Half life of radioactive isotopes is independent of initial amount of the isotope.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Half-life of a radioactive isotope is the time required for the isotope to become half of its initial mass.
$t_{1 / 2} = \frac{0.693}{K}$
From the expression of the half-life, it is clear that it is independent of the initial concentration of the isotope.

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