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ICSE Class 8 Chemistry Question 14 of 15

Chemical Reactions — Question 5

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Question

Question 9

Certain thermal decomposition reactions, result in formation of oxides. Give balanced equations for the thermal decomposition of the following, which result in formation of a metallic oxide.

(a) Limestone

(b) Lead carbonate

(c) Calcium nitrate

(d) Calcium hydroxide.

Answer

(a) Thermal decomposition of limestone

CaCO3 →Δ\xrightarrow\Delta CaO + CO2

(b) Thermal decomposition of lead carbonate

PbCO3 →Δ\xrightarrow\Delta PbO + CO2

(c) Thermal decomposition of calcium nitrate

2Ca(NO3)2 →Δ\xrightarrow\Delta 2CaO + 4NO2 + O2

(d) Thermal decomposition of calcium hydroxide.

Ca(OH)2 →Δ\xrightarrow\Delta CaO + H2O