(a) In this reaction, calcium carbonate decomposes into calcium oxide and carbon dioxide on heating. This reaction is carried out by heating.
In this reaction, energy is supplied in the form of heat.
(b) Sliver chloride turns grey in sunlight to form silver metal.
In this reaction, energy is supplied in the form of light, i.e. sunlight.
(c) When acidified water is electrolysed, it decomposes to form hydrogen and oxygen:
2H20 (I) → 2H2 (g) + O2 (g)
In this case, energy is supplied in the form of electricity.
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