(A) : Rate of reaction increases with increase in concentration of reactants.
(R) : Number of effective collisions increases with increase in concentration of reactants.

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

Both (A) and (R) are correct and (R) is 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

As the concentration of reactants increases, the number of molecules per unit volume and the number of effective collisions increase. Consequently the rate of reaction increases.

Therefore, the correct option is (A).

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