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Byju's Answer
Standard VII
Chemistry
Effect of Catalyst
In presence o...
Question

In presence of a catalyst, what happens to the chemical equilibrium?

A
Energy of activation of the forward and backwards reactions are lowered by same amount.
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B
Equilibrium amount is not disturbed.
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C
Rates of forward and reverse reaction increase by the same factor.
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D
More product is formed.
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Solution

The correct options are
A Energy of activation of the forward and backwards reactions are lowered by same amount.
B Equilibrium amount is not disturbed.
C Rates of forward and reverse reaction increase by the same factor.
By adding catalyst to a reaction the energy of activation of both forward and backward reactions are lowered thereby both forward and backward reactions increase in same amount and thus the equilibrium remains unaffected.

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Q. Assertion :A catalyst does not alter the equilibrium constant of the reaction. Reason: The catalyst forms a complex with the reactants and provides an alternate path with the lower energy of activation for the reaction; the forward and backward reactions are affected to the same extent.
Q. The energies of activation for forward and reverse reactions for (A2+B2⇌2AB) are 180kJ mol−1 and 200kJ mol−1 respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100kJ mol−1. The enthalpy change of the reaction (A2+B2→2AB) in the presence of catalyst will be (in kJ mol−1)
Q. The energies of activation forA2+B2⇌2AB are 180kJ mol−1 forward and 200kJ mol−1 reverse reactions respectively. The presence of catalyst lowers the activation energies of both (forward and reverse) reactions (A2+B2⇌2AB) by 100kJ mol−1. The magnitude of enthalpy change of the reaction in the presence of catalyst will be (in kJ mol−1):
Q. Assertion :A catalyst does not alter the equilibrium constant of a reaction. Reason: The catalyst forms a complex with the reactants and provides an alternate path with lower energy of activation for the reaction; the forward and back ward reactions are affected to the same extent.
Q. Assertion : A catalyst that increases the rate of a forward reaction also increases the rate of the reverse reaction
Reason : The activation energy for a forward reaction is necessarily equal to the of the reverse reaction.
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