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Q.

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

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a

magnesium nitrate

b

calcium nitrate

c

barium nitrate

d

strontium nitrate

answer is B.

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Detailed Solution

Calcium salts impart brick red colour to flame. Also,

$Ca {({NO}_{3})}_{2} \overset{Δ}{\to} CaO \underset{Brown gas}{+ 2 {NO}_{2} ↑ +} \frac{1}{2} O_{2} ↑$

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