Which of the following statements is not correct for the catalyst? A. it catalyses the forward and backward reaction to the same extent. B. it alters \[\Delta G\] of the reaction. C. it is a substance that does not change the equilibrium constant of a reaction. D. if provides an alternate mechanism by reducing activation energy between reactants and products.
Hint: Catalyst is a common word that you might come across while studying chemistry especially while learning about chemical reactions. While some of the chemical reactions occur quickly, some take a long time and require extra materials or effort. So, catalysts are defined as those substances which alter the rate of reaction by changing the path of reaction.
Complete answer: A catalyst can be either solid, liquid or gaseous catalyst. A catalyst increases reaction rates in a slightly different way from other methods of increasing reaction rate. The function of a catalyst is to lower the activation energy so that a greater proportion of the particles have enough energy to react. Types of Catalysts are: 1) Positive Catalysts : Catalysts which increase the rate of a chemical reaction are positive catalysts. 2) Negative Catalysts: Catalysts which decrease the rate of reaction and negative catalyst. The function of a catalyst is to lower the activation energy so that a greater proportion of the particles have enough energy to react. A catalyst increases the rate of reaction by decreasing the activation energy of the reaction. It does not affect the Gibbs free energy \[\Delta G\] of the reaction.
Thus, the statement given in option (B) is incorrect.
Note: In essence, catalysts encourage molecules to react and make the whole reaction process easier and efficient.