Which from following compounds is obtained as by product in synthesis of sodium carbonate by Solvay process?

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The Solvay process is used for the industrial preparation of sodium carbonate. The overall reaction for the process can be represented as:

$2 N a Cl + C a C O_{3} \to N a_{2} C O_{3} + C a C l_{2}$

During the process, sodium bicarbonate precipitates out and ammonium chloride is formed in the solution:

$N H_{3} + H_{2} O + C O_{2} + N a Cl \to N a H C O_{3} + N H_{4} Cl$

Ammonia is recovered for reuse by treating the ammonium chloride solution with calcium hydroxide:

$2 N H_{4} Cl + C a (O H)_{2} \to 2 N H_{3} + C a C l_{2} + 2 H_{2} O$

In this recovery step, calcium chloride is formed. Since it is not reused in the process, it is obtained as the final byproduct.

Answer: Calcium Chloride

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