Give six uses of decomposition reaction.

3

(a)

Mohan took pure water for the electrolytic decomposition of water but did not see any bubble near the electrodes. Explain why?

3

(a)

A teacher took few crystals of sugar in a dry test tube and heated the test tube over flame. The colour of sugar turned black. Explain why?

3

(a)

Blue crystals of copper sulphate on heating in a dry test tube become colourless. Give reasons.

3

(a)

FeSO₄.7H₂O, green colour crystals on heating, changes colour. Why?

3

(a)