In the preparation of sodium carbonate, which of the following is used as raw material?

Slaked lime

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Quick lime

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Lime stone

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Sodium hydroxide

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Solution

The correct option is C Lime stone
Option $(C)$ is correct.
Limestone is used as raw material in the preparation of sodium carbonate. It is called Solvay process.
The Solvay process results in sodium carbonate ( $N a_{2} C O_{3}$ ) from brine (as a source of sodium chloride ( $N a C l$ ) and from limestone (as a source of calcium carbonate ( $C a C O_{3}$ ).
$2 N a C l + C a C O_{3} \to N a_{2} C O_{3} + C a C l_{2}$

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