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ICSE Class 10 Chemistry Question 50 of 63

Study of Compounds — Nitric Acid — Question 50

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Question

Question 4(2015)

From the list of the following salts — AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2. State the salt which on heating, evolves a brown coloured gas.

Answer

Ca(NO3)2

2Ca(NO3)2→Δ2CaO+O2+4NO22\text{Ca(NO}_3)_2 \xrightarrow{\Delta} 2\text{CaO} + \text{O}_2 + 4\text{NO}_2