Question

On the velocity in a reversible reaction, the correct explanation of the effect of the catalyst is-
A. It provides a new reaction path of low activation energy
B. It increases the kinetic energy of reacting molecules
C. It displaces the equilibrium state on the right side
D. It decreases the velocity of the backward reaction

Answer 1

Hint: In a chemical reaction when reactants react to form the products at a certain concentration of the products, the products start to convert into the reactant simultaneously. Both reactions proceed simultaneously. Such types of reactions are called reversible reactions. A catalyst is used to change the rate of reaction.

Complete answer:A catalyst is a substance, compound, or element which is used in a reaction to change its rate of reaction or to form any specific product in the reaction. Catalyst themselves does not react in the reaction they only provide an alternative way to the reaction. The amount of catalyst used in the reaction remains constant. Catalysts are used to increase or decrease the rate of reaction, generally, it is used to increase the rate of reaction. A small amount of catalyst is required for increasing the rate of reaction for a large amount of reactants. When the reaction takes a longer duration to complete a reaction it shows that the reactant is having higher energy of activation to lower that energy of activation catalyst is used. The catalyst provides another pathway with a lower energy of activation of the reactant to the reaction.


















The above graph describes the activity of the catalyst in the reaction.

Thus, Option (A) is correct

Note: Not all reaction gets effect by the catalyst. Some reactions do not change their rate of reaction in presence of a catalyst. One catalyst cannot act as a catalyst in all reactions. Reactions have their suitable and specific catalysts.