Question

Write answer as directed.
What is a catalyst ? Write any one reaction which is brought about by use of catalyst ?

Answer 1

Catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

For example:

E.g.	Name of process	Equations (in words or formulae)	Catalyst
1	Fermentation of glucose to form ethanol	Glucose → Ethanol + Carbon dioxide	Specific enzymes (in yeast)
2	Hydration of ethene to form ethanol	Ethene + Water (Steam) Heat →Ethanol	Phosphoric Acid
3	Hydrogenation of unsaturated fats (to harden oils in the manufacture of margarine)	Hydrogen + Unsaturated Fats →Saturated Fats	Nickel (Ni)
4	Haber's process	Nitrogen +Hydrogen → Ammonia	Iron