Question

In a homogenous catalysis:

• A. The catalyst and the reactants should be gases
• B. The catalyst and the reactants are in same phases
• C. The catalyst and the reactants are in different phases
• D. The catalyst and the reactions are all liquids

Answer 1

The correct option is B The catalyst and the reactants are in same phases

Catalyst can be classified into many types based on different parameters.
On the basis of phases, the catalyst is of two types,
1. Homogeneous catalyst
2. Heterogeneous catalyst

Homogeneous catalyst:
When catalysts and reactants are in the same phase​, then the catalyst is called homogeneous catalyst and the process is called homogenous catalysis.
Example:
$C{H}_{3}COO{C}_2{H}_5\left(l\right)+H_{2}O\left(l\right)\stackrel{HCl\left(l\right)}{⟶}C{H}_{3}COOH\left(aq\right)+C{H}_{3}OH\left(aq\right)$

Here, $HCl$ act as catalyst and both the catalyst and reactants are in same liquid phase so it is a homogeneous catalyst.