Write examples for chemical decomposition reaction.

1.	Write examples for chemical decomposition reaction.
Answer» 1) Calcium carbonate on heating decomposes to calcium oxide and carbon dioxide. CaCO → CaO + CO₂ 2) On electrolysis, water decomposes to water and hydrogen. 2 H₂O → 2 H₂ + O₂ 3) Silver bromide decomposes to silver and bromine in sunlight. 2 AgBr → 2 Ag + Br₂ 4) Silver chloride decomposes to silver and chlorine. 2 AgCl → 2 Ag + Cl₂ 5) Glucose decomposes to ethanol and carbon dioxide. C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂ 6) Sodium bicarbonate decomposes to sodium carbonate, water and carbon dioxide. 2 NaHCO₃ + Heat → Na₂CO₃ + H₂O + CO₂ 7) On heating lead nitrate decomposes to lead oxide, oxygen and nitrogen dioxide. 2Pb(NO₃)₂ → 2PbO + 4 NO₂+ O₂

Answer»

1) Calcium carbonate on heating decomposes to calcium oxide and carbon dioxide.

CaCO → CaO + CO₂

2) On electrolysis, water decomposes to water and hydrogen.

2 H₂O → 2 H₂ + O₂

3) Silver bromide decomposes to silver and bromine in sunlight.

2 AgBr → 2 Ag + Br₂

4) Silver chloride decomposes to silver and chlorine.

2 AgCl → 2 Ag + Cl₂

5) Glucose decomposes to ethanol and carbon dioxide.

C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂

6) Sodium bicarbonate decomposes to sodium carbonate, water and carbon dioxide.

2 NaHCO₃ + Heat → Na₂CO₃ + H₂O + CO₂

7) On heating lead nitrate decomposes to lead oxide, oxygen and nitrogen dioxide.

2Pb(NO₃)₂ → 2PbO + 4 NO₂+ O₂

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