The substance that is not required in solvay process?

S O_{2}

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N H_{3}

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C O_{2}

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N a C l

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Solution

The correct option is A $S O_{2}$
Solvay process is extensively used for the industrial preparation of sodium carbonate. The process involves the following reactions:
$2 N H_{3} + H_{2} O + C O_{2} \to (N H_{4})_{2} C O_{3}$
$(N H_{4})_{2} C O_{3} + H_{2} O + C O_{2} \to N H_{4} H C O_{3}$
$N H_{4} H C O_{3} + N a C l \to N a H C O_{3} + N H_{4} C l$
$2 N a H C O_{3} \to N a_{2} C O_{3} + H_{2} O + C O_{2}$

So, $S O_{2}$ is not used in solvay process.

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