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

calcium carbonate

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magnesium carbonate

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magnesium nitrate

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calcium nitrate

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Solution

The correct option is D calcium nitrate
In the flame test, calcium metal gives brick red color.
Thermal decomposition of calcium nitrate gives calcium oxide, nitrogen dioxide, nitrogen (brown color) and oxygen gas.
$4 C a (N O_{3})_{2} \to 4 C a O + 6 N O_{2} + N_{2} + 4 O_{2}$

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

The correct option is D calcium nitrateIn the flame test, calcium metal gives brick red color.Thermal decomposition of calcium nitrate gives calcium oxide, nitrogen dioxide, nitrogen (brown color) and oxygen gas.4Ca(NO3)2→4CaO+6NO2+N2+4O2

The correct option is D calcium nitrate
In the flame test, calcium metal gives brick red color.
Thermal decomposition of calcium nitrate gives calcium oxide, nitrogen dioxide, nitrogen (brown color) and oxygen gas.
$4 C a (N O_{3})_{2} \to 4 C a O + 6 N O_{2} + N_{2} + 4 O_{2}$