Question

31. (a) Werite one example fou
one example for each of decompositis
reaction carried out with help of
(W Electricity (i) Heat Lil Light
b) Which of the following statements is
correct and why copper can displace
silver from silver niterate and silver
can displace copper from copper.
sulphate solution?
​

Answer 1

Decomposition is a chemical reaction, In which the single compound breaks into plenty of compounds or an element.

EXPLANATION:

Thermal decomposition: The process of decomposition of a single substance into more than one substance by heat is called thermal decomposition.

Example:

\frac{2 F e(O H)_{3}}{F E R R I C \text { HYDROXIDE}} \overrightarrow{\text { Heat }} F e_{2} O_{3}+3 H_{2} O

FERRIC HYDROXIDE

2Fe(OH)

3

Heat

Fe

2

O

3

+3H

2

O

Electrolytic decomposition: The decomposition by electric current is called electrolytic decomposition process.

Example: 2 \text { Nacl electricity } 2 \mathrm{Na}+\mathrm{Cl}_{2}2 Nacl electricity 2Na+Cl

2

Photo decomposition: The decomposition by light is called Photo decomposition process.

Example: 2 A g C l \rightarrow 2 A g+C l_{2}2AgCl→2Ag+Cl

2