A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is
(a) magnesium nitrate (b) calcium nitrate (c) barium nitrate (d) strontium nitrate

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Solution

Answer: (b) calcium nitrate

Calcium gives brick red coloured flame. Hence, fcalcium nitrate on heating decomposes into calcium oxide, with evolution of a mixture of $N O_{2}$ and $O_{2} .$
$2 C a (N O_{3})_{2} ⟶ 2 C a O + 4 N O_{2} b r o w n g a s + O_{2}$
$N O_{2}$ is brown coloured gas.

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