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Assertion (A) : A catalyst provides an a...

Assertion (A) : A catalyst provides an alternative path to the reaction in which conversion of reactants into products takes place quickly
Reason (R) : The catalyst forms an activated complex of lower potential energy with the reactants.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true but R is not a correct explanation of A

C

A is true but R is false

D

A is false but R is true

Text Solution

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The correct Answer is:
A
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Statement-1: A catayst provides an alternative path to the reaction in which conversion of reactants into products take place quickly. Statement-2: The catalyst forms an activated comlex of lower potential energy, with the reactants by which more number of molecules are able to cross the barrier per unit of time.

Assertion (A) : Greater the value of K, more is the fraction of initial concentration of reactants converted to products at equilibrium. Reason (R) : The value of K depends on the initial concentration of reactants.

Assertion(A): A catalyst speed up a reaction but does not participate in its mechanism. Reason(R): A catalyst provides an alternative path of lower activation energy to the reactants.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst. Reason (R) A catalyst participating in the reaction froms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.

Assertion (A) : The rate of reaction can also increase w.r.t its product if one of the products act as catalyst Reason (R) : A catalyst lowers the activation energy of reactions.

Assertion (A) : Catalyst increases the rate of a reaction Reason (R) : It lowers the threshold energy of the reaction.

Assertion (A) : When a catalyst is added to a reaction mixture in equilibrium the amount of the products increases. Reason (R) : The forward reaction becomes faster on adding the catalyst.

DINESH PUBLICATION-RATES OF REACTIONS AND CHEMICAL KINETICS-Assertion or Reason
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  15. Assertion (A) : The multi molecular reactions are quite rare in compar...

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