A substance which burns with a brick red flame and decomposes 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
$M g$ does not impart any colour to the flame. $C a$ burns with brick red flame colour. Also,
$C a (N O_{3})_{2} \to C a O + 2 N O_{2} + \frac{1}{2} O_{2}$
$N O_{2}$ is the brown gas.

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A substance which burns with a brick red flame and decomposes on heating, giving oxygen and a brown gas is:

The correct option is D calcium nitrateMg does not impart any colour to the flame. Ca burns with brick red flame colour. Also, Ca(NO3)2→CaO+2NO2+12O2 NO2 is the brown gas.

The correct option is D calcium nitrate
$M g$ does not impart any colour to the flame. $C a$ burns with brick red flame colour. Also,
$C a (N O_{3})_{2} \to C a O + 2 N O_{2} + \frac{1}{2} O_{2}$
$N O_{2}$ is the brown gas.