A catalyst speeds up a chemical reaction by :

changing the stoichiometry.

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increasing the activation energy.

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providing an alternative reaction mechanism of lower activation energy.

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none of the above

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Solution

The correct option is A providing an alternative reaction mechanism of lower activation energy.
A catalyst speeds up a chemical reaction by providing an alternative reaction mechanism of lower activation energy but do not get consumed by the reaction. It also does not change the heat absorbed or liberated in the reaction as well as the rate constant.

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Similar questions

Q. Assertion :A catalyst speeds up a reaction but doesn't participate in its mechanism. Reason: A catalyst provides an alternative path of lower activation energy to the reactants.

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

Mark the incorrect statements.
(a)Catalyst provides an alternative pathway to reaction mechanism
(b)Catalyst raises the activation energy
(c)Catalyst lowers the activation energy
(d)Catalyst alters enthalpy change of the reaction

Q. Assertion: The addition of a catalyst will decrease the

Δ H

for a reaction.
Reason: Catalysts provide alternate reaction paths with lower activation energies.

Q. Statement 1: A catalyst accelerates a chemical reaction.
Statement 2: A catalyst lowers the activation energy of the reaction.

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