Ncert Exercises & Solutions

A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is

1. Magnesium nitrate

2. Calcium nitrate

3. Barium nitrate

4. Strontium nitrate

Hint: Calcium compound give red colour on heating

Calcium gives brick red coloured flame. Hence, calcium nitrate on heating decomposes into calcium oxide, with the evolution of a mixture of NO₂ and O₂.

2 Ca(NO₃)₂→ 2 CaO + NO₂ + O₂

NO₂ is brown coloured gas.

Barium nitrate gives Green colour on heating.
Magnesium nitrate gives no colour.
Strontium nitrate gives crimson red.

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