A chemical A is used for the preparation of washing soda to recover ammonia. When $C O_{2}$ 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?
(a) $C a (H C O_{3})_{2}$ (b) CaO (c) $C a (O H)_{2}$ (d) $C a C O_{3}$

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Solution

To recover $N H_{3}$ in solvary ammonia soda process $C a (O H)_{2}$ is used
$2 N H_{4} C l + C a (O H)_{2} ⟶ 2 N H_{3} + C a C l_{2} + 2 H_{2} O$
On passing $C O_{2}$ through $C a (O H)_{2}$ , it turns milky due to the formation of $C a C O_{3}$ .
$C a (O H)_{2} + C O_{2} ⟶ C a C O_{3} ↓ + H_{2} O$

$C a (O H)_{2}$ is used for whitewashing due to disinfectant nature.

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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? (a) Ca(HCO3)2 (b) CaO (c) Ca(OH)2 (d) CaCO3

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