Q.

(A) : A catalyst increases the rate of a reaction.
(R) : In presence of a catalyst, the activation energy of the reaction increases.

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a

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

 

b

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

 

c

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

 

d

(A) and (R) both are wrong.

answer is C.

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Detailed Solution

A catalyst increases rate of reacting by decreasing activation energy. and increasing the enthalpy change of the reaction.

Therefore, the correct option is (C).

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