Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
Answer
Energy is supplied in the form of heat;
Decomposition of Calcium Carbonate (CaCO 3 )
On heating of Calcium Carbonate (limestone),
It decomposes into Calcium Oxide (Quick Lime) + Carbon Dioxide
CaCO 3 (s) → CaO(s) + CO 2 (g)
(Limestone) Heat (Quick lime)
Energy is supplied in the form of light;
Silver Chloride turns grey in sunlight
It is because, the heat of sunlight decomposes silver chloride into silver and chlorine
2AgCl(s) → 2Ag(s) + Cl 2 (g)
Sunlight
Energy is supplied in the form of electricity;
Electrolysis of water
The breaking down of H 2 O into H 2 and O 2 by passing electricity is known as electrolysis of water.
2H 2 O → 2H 2 + O 2
Electricity
