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

C a C O_{3}

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M g 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 B $M g C O_{3}$
Stability of carbonates increases down the group with increase in the size of metal ion. Also the alkali metal carbonates are more stable than alkaline earth metal carbonates.
Hence, $M g C O_{3}$ is least stable and it releases $C O_{2}$ most easily.

Hence, option (b) is correct.

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