Question

Which of the following reaction is not an example of combination reaction
(a) Burning of coal
(b) Formation of water from hydrogen & oxygen
(c) Formation of quick lime on heating lime stone
(d) Formation of Ammonia from hydrogen & nitrogen​

Answer 1

Answer:

b) Formation of water from hydrogen & oxygen

Answer 2

Answer:

c) Formation of quick lime on heating limestone.

Because when limestone is heated, quicklime formed and carbon dioxide gas released.

CaCO3 (s) → CaO (s) + CO2 (g)

So, it is a decomposition reaction.