(A) Units of rate of reaction are independent of order of the reaction.
(R) Rate of reaction is the change in concentration of reactants in unit time.

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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 A.

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Detailed Solution

Rate of reaction does not remain constant during the complete reaction because rate depends upon the concentration of reactants which decreases with time.

The assertion and the reason given in the question are correct and the reason is the correct explanation for the given assertion.

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