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(C) $Ca(OH)_2$ (calcium hydroxide) is used in the Solvay process for the preparation of washing soda $(Na_2CO_3 \cdot 10H_2O)$ to recover ammonia $(NH

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$Ca(OH)_2$

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(C) $Ca(OH)_2$ (calcium hydroxide) is used in the Solvay process for the preparation of washing soda $(Na_2CO_3 \cdot 10H_2O)$ to recover ammonia $(NH_3)$ from ammonium chloride $(NH_4Cl)$.$2NH_4Cl + Ca(OH)_2 \longrightarrow 2NH_3 + CaCl_2 + 2H_2O$When $CO_2$ is passed through an aqueous solution of $Ca(OH)_2$ (lime water),it forms $CaCO_3$,which makes the solution milky.$Ca(OH)_2 + CO_2 \longrightarrow CaCO_3 \downarrow + H_2O$$Ca(OH)_2$ is also used in white washing due to its disinfectant nature.Therefore,the correct option is $C$.

$A$ chemical $A$ is used for the preparation of washing soda to recover ammonia. When $CO_2$ is bubbled through an aqueous solution of $A$,the solution turns milky. It is used in white washing due to its disinfectant nature. What is the chemical formula of $A$?

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