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  4. A chemical 'A’ is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of 'A’, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of 'A' ?

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Q. 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 disinfectant nature. What is the chemical formula of $'A'$ ?

The s-Block Elements

Solution:

$Ca(OH)_2$ is used in Solvay process i.e., preparation of washing soda $(Na_2CO_3 \cdot 10H_2O)$ to recover $NH_3$.
$2NH_4Cl+\underset{'A'}{Ca(OH)_2} \rightarrow 2NH_3 + CaCl_2 + H_2O$
$\underset{'A'}{Ca(OH)_2} +CO_2 \rightarrow \underset{\text{Milkincss}}{CaCO_3 \downarrow }+ H_2O$
$Ca(OH)_2$ is used in white washing due to its disinfectant nature.