Question

8. (a) Write one reaction for following: (I) Evolution of gas (ii) Evolution of heat.
(b) Write characteristics of chemical equation with example.

Answer 1

Explanation:

a. H2O=H2+O2

b. CaO+CO2=CaCO3

Answer 2

Answer:

Gas evolution reactions are a type of double displacement reaction where one of the products is a gas. ... For example, carbonic acid breaks down to water and carbon dioxide, sulfurous acid breaks down to water and sulfur dioxide, and ammonium hydroxide breaks down to water and ammonia gas.When ferrous sulphate which is pale green substance on decomposition produce brown colour residue of ferric acid and oxides of sulphur.

A

2FeSO

4

(s)

⟶

B

Fe

2

O

3

(s)

+SO

2

(g)+SO

3

(g)