Which of the following reactions correctly represent(s) the preparation of $M g C O_{3}$ ?

M g (H C O_{3})_{2} h e a t \to M g C O_{3} + H_{2} O + C O_{2}

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M g (H C O_{3})_{2} + M g O \to 2 M g C O_{3} + H_{2} O

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M g S O_{4} + 2 N a H C O_{3} \to M g C O_{3} + N a_{2} S O_{4} + H_{2} O + C O_{2}

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None of these

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Solution

The correct options are
A $M g S O_{4} + 2 N a H C O_{3} \to M g C O_{3} + N a_{2} S O_{4} + H_{2} O + C O_{2}$
B $M g (H C O_{3})_{2} h e a t \to M g C O_{3} + H_{2} O + C O_{2}$
D $M g (H C O_{3})_{2} + M g O \to 2 M g C O_{3} + H_{2} O$
$M g$ carbonate can be produced by all of these reactions.
$M g S O_{4} + 2 N a H C O_{3} \to M g C O_{3} + N a_{2} S O_{4} + H_{2} O + C O_{2}$
$M g (H C O_{3})_{2} + M g O \to 2 M g C O_{3} + H_{2} O$
$M g (H C O_{3})_{2} h e a t \to M g C O_{3} + H_{2} O + C O_{2}$

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Which of the following reactions correctly represent(s) the preparation of $M g C O_{3}$ ?