Question

A Catalyst is a substance which:
A.increases the equilibrium concentration of the product
B.Changes the equilibrium constant of the reaction
C.Shortens the time to reach equilibrium
D.Supplies energy to reaction

Answer 1

Hint:A catalyst is a substance that increases the speed of a reaction. a catalyst does not affect the extent or position of a reaction at equilibrium. It helps a reaction achieve equilibrium faster.

Complete step by step answer:
As we know that a catalyst is a substance which shortens the time needed for the reaction to reach equilibrium, Therefore, out of the given four options, C is the correct option. A, B and D are incorrect options.

Additional information:
We know that a reaction can be sped up by adding a catalyst, including reversible reactions that involve a final equilibrium state. In any reversible reaction, the equilibrium state refers to the state where the forward and reverse reaction rates are seen to be equal. In the presence of a catalyst, both the reverse and the forward reaction rates equally speed up allowing the system to reach the equilibrium faster.
We can state that a catalyst is a compound that results in the acceleration of the progress of a reaction without itself being consumed. Some examples of catalysts include enzymes and acid catalysts. Catalysts allow a reaction to proceed faster through the transition state having lower energy.
Enzymes are proteins that act as catalysts in biochemical reactions. Common types of catalysts include enzymes, acid-base catalysts, and heterogeneous (or surface) catalysts.

Note:
A catalyst speeds up a reaction. They do this by lowering the activation energy that is needed for the proceeding of the reaction. The same amounts of reactants and same number of products exist at equilibrium as that would exist in the uncatalyzed reaction in the presence of a catalyst.