On heating which of the following releases $C O_{2}$ most easily?

M g C O_{3}

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C a C O_{3}

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K_{2} C O_{3}

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N a_{2} C O_{3}

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Solution

The correct option is A $M g C O_{3}$
Thermal stability order
$K_{2} C O_{3} > N a_{2} C O_{3} > C a C O_{3} > M g C O_{3}$
Therefore $M g C O_{3}$ releases $C O_{2}$ most easily as it is the least stable of all the carbonates.
$M g C O_{3} Δ - \to M g O + C O_{2}$

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