Question

In a homogeneous catalysis
A. The catalyst and the reactants should be gases
B. The catalyst and the reactants should be from a single phase
C. Catalyst and the reactants are all solids
D. The catalyst and the reactions are all liquids

Answer 1

Hint: Catalyst is a substance that makes a reaction faster and does not get eaten up in the process by the process called catalysis. Homogeneous catalysis involves the reactants and catalyst in the same phase.

Complete Step by Step Answer:
The reaction happens at a faster rate after the addition of a catalyst.
The catalyst does not possess any change in terms of the chemical composition and mass after the end of the reaction.
It does not get destroyed during the reaction.
It reduces the activation energy of the reactants. Due to lower activation energy, a significant number of reactant species partake in the reaction thereby raising the rate of reaction.
Its physical state like size, colour, etc., may alter.
When in a reaction the catalyst is present in the identical phase as the reactants, it is called homogeneous catalysis.
For example,
Gaseous phase:
In this type of reaction, the reactant, and catalyst are from the gaseous phase.
A) Reaction of sulphur dioxide and oxygen in presence of nitric acid.
B) Decomposition of acetaldehyde in the presence of iodine vapours.
Liquid phase:
The reactant and catalyst both are in the liquid phase.
A) Hydrolysis of cane sugar in presence of a mineral acid.
B) Hydrolysis of the ester
So, B is correct.
So, option D is correct.

Note: It must be remarked that catalysts only speed up the rate of reaction, remain the same after the reaction, and maintain specific activity. It doesn't get used up during the reaction.