(A) : If in a zero order reaction, the concentration of the reactant is doubled, the half-life period is also doubled.
(R) : For a zero order reaction, the rate of reaction is independent of initial concentration.

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Both (A) and (R) are correct and (R) is the correct explanation of (A).

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

(A) is correct but (R) is wrong.

(A) and (R) both are wrong.

answer is B.

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Detailed Solution

For a zero order reaction, $t_{1 / 2} = [A_{0}] / 2 K$ .
As half life for zero order reaction is directly proportional to initial concentration, hence doubling the concentration of reactant, half life get doubled.
For a zero order reaction, the rate of reaction is independent of initial concentration.