Question

Select the correct statement from the following.
(A) Equilibrium constant changes with addition of catalyst.
(B) Catalyst increases, rate of forward reaction.
(C) The ratio of mixture at equilibrium doesn’t change by catalyst.
(D) Catalysts are active only in solution.

Answer 1

Hint: We know that the equilibrium represents a state of process in which property like a temperature, pressure or concentration of a system doesn’t show any change with passage of time. If the reaction is at chemical equilibrium the rate of a forward reaction as well as backward reaction will equal. The mixture of reactants along with products in equilibrium state is called equilibrium mixture.

Complete step by step solution:
When there isn’t change in concentration of reactant and product with time then point is called chemical equilibrium. Then we can say equilibrium means the reactant is going to a product where the rate of forward reaction/reactant to product is equal to rate of backward reaction/products to reaction. We could also say that the rate at which reactants turn into products is equal to the rate at which products turn into reactants. Equilibrium is represented with the symbol $ \rightleftharpoons $.
There are various examples of a chemical equilibrium in the surrounding area. One example is a bottle of fizzy drink. The bottle has liquid dissolved carbon dioxide into itself. There is also $ C{{O}_{2}} $ gas present in space between liquid as well as bottle cap. There is constant movement of $ C{{O}_{2}} $ from liquid to gas phase, as well as from gas to liquid phase immediately. However, if we look at the bottle, there doesn’t appear to be any change. This is point at which system has reach chemical equilibrium/where rate of forward reaction is equal to rate of backward reaction)
Also addition of Catalyst has no effect on the value of equilibrium constant. Catalyst increases the rate of forward as well as backward reaction in an equal proportion. The ratio of mixture at equilibrium doesn’t change by catalyst. Catalyst may be of a solid, liquid or gas state
Therefore, both Option B & C is correct option i.e. Catalyst increases rate of forward along with ratio of mixture at equilibrium doesn’t change by catalyst.

Note:
Note that by adding a catalyst to reaction, energy of activation of both forward as well as backward reactions is lower. Therefore, both forward and backward reactions increase in the same amount as well as equilibrium remain unaffected. Catalysts are basically compounds which accelerate the rate of reaction without being consumed.