Which of the following statements are correct about solid catalyst?

Options

A. Same reactants may give different products by using different catalysts
B. Catalyst does not change `DeltaH` of reaction
C. Catalyst is required in large quantities to catalyse reactions
D. Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption

Answer

A, B

Explanation

(a) Same reactants may give different products by using different catalysts as different catalysts have different specific functions to mold the reaction towards specific product.
e.g., starting with `H_(2)` and CO, and using different catalysts, we get different products.
(i) `CO(g)+3H_(2) overset(Ni)(to)CH_(4)(g)+H_(2)O(g)`
(ii) `CO(g)+2H_(2)(g) underset(Cr_(2)O_(3))(overset(Cu//ZnO)(to))CH_(3)OH(g)`
(iii) `CO(g)+H_(2)(g) overset(Cu)(to)HCHO(g)`
(b) Catalyst does not change `DeltaH` of reaction as `DeltaH` of reaction is difference between enthalpy of reactants and products. So, it does not change during catalysed reaction.