Define the term – double decomposition – neutralization reaction with a suitable representation.

Convert :

(a) an insoluble base (b) a soluble base

to their respective soluble salts by neutralization reaction.

Explain the term energy changes in a chemical change. Give an example with a balanced equation, for each of the following reactions:

(a) exothermic reaction

(b) endothermic reaction

(c) photochemical reaction

(d) electrochemical reaction.

Choose the conversion reaction which is exothermic & takes place by supply of catalytic energy.

1. Hydrogen to HCl
2. Ammonia to nitric acid
3. Nitrogen to nitric oxide
4. Oxygen to ozone.