Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.

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Solution

(1.) $Decomposition on heating$

Calcium carbonate when heated gives quicklime $(C a O)$ and carbon dioxide

$C a C O_{3} \to C a O + C O_{2}$

(2.) $Decomposition by light$

Silver chloride decomposes to silver and chlorine in presence of sunlight

$2 A g C l \to 2 A g + C l_{2}$

(3). $Decomposition by electricity$

Water on electrolysis gives hydrogen and oxygen

$2 H_{2} O \to 2 H_{2} + O_{2}$

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