What is decomposition reaction. Give three examples.

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Solution

Reactions in which one compound decomposes in two or more compounds or element are known as DECOMPOSITION REACTION. Decomposition reaction is just opposite of combination reaction.

Example:

1)When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide

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

Calcium carbonate \rightarrow Calcium oxide + Carbon dioxide

2)When ferric hydroxide is heated, it decomposes into ferric oxide and water

$2 F e (O H)_{3} \to F e_{2} O_{3} + 3 H_{2} O$

Ferric hydroxide \rightarrow Ferric oxide + Water

3)When lead nitrate is heated, it decomposes into lead oxide, nitrogen dioxide and oxygen.

$2 P b (N 0_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$

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All decomposition reaction are endothermic.justify and also give examples.

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