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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

2CaNO32⟶Δ2CaO+4NO2↑ Brown gas +O2↑ The substance giving the brick red colour to the flame, means the given substance is calcium salt
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