A metal carbonate, $M_{x} C O_{3}$ , is heated in a closed container and the product is passed through lime water and lime water turns milky.The metal $M$ can be:

B a

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M g

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N a

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K

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Solution

The correct option is B $M g$
Carbonates of $L i$ and $M g$ decompose on heating and liberate $C O_{2}$ Carbonates of other alkali metals are stable towards heat and decomposed only by fusion. $C O_{2}$ turns lime water milky.

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