Question

Which one of the following statements is not correct?
A. Coenzymes increase the catalytic activity of enzymes.
B. Catalyst does not initiate any reaction.
C. The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.
D. Enzymes catalyse mainly bio-chemical reactions.

Answer 1

We know that the coenzyme helps the enzyme to do its process faster to increase the rate of reaction by converting reactants into products faster and more easily by lowering the activation energy of the overall reaction.
Equilibrium constant is defined as the constant when the rate of forward reaction is equal to the rate of reverse reaction. The concentration of reactants and products are constant at equilibrium. The value of equilibrium constant can be determined if we know the concentration of the reactants and products.

Complete answer
The reaction will start taking place in the presence of enzyme and coenzyme. It will help to break the bond of the reactants molecules by providing the proper surface and the required reaction conditions. The enzyme will act as a lock in which reactants will act as key buy inserting it in the enzyme it will modify the reactants into the desired products and coenzyme will help enzyme to increase the rate of reaction in forward direction.
The product will be detached and again we will get the enzyme which is reusable. The product obtained will be extracted. During this process the desired catalyst or enzyme used will lower the activation energy hence the reactants will easily get converted into the product and the concentration will remain the same. The condition will come at which the concentration of reactants is equal to that of product, it is an equilibrium condition, the value of that is equilibrium constant and it is dependent on concentration of reactants and not on the catalyst.

**Hence, the incorrect option is (C). The value of equilibrium constant is changed in the presence of catalyst in the reaction at equilibrium

Note: **
The equilibrium constant can be used to determine the half life time of the reaction. It gives us information of the concentration of the reactants used up and the product formed at different time interval.it also helps us to find the age of the old objects which contain carbon atoms.