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Question
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 whitewashing due to disinfectant nature. What is the chemical formula of A?
Options
Ca(HCO3)2
CaO
Ca(OH)2
CaCO3
Solution
Ca(OH)2
Explanation:
The chemical formula of A is Ca(OH)2. Sodium carbonate is prepared by Solvay's process. In this process, ammonia is recovered when ammonium chloride reacts with calcium hydroxide. On reacting NH4Cl with Ca(OH)2, calcium chloride is obtained as a by-product. The reaction is given below.
\[\ce{2NH4Cl + Ca(OH)2 -> 2NH3 + CaCl2 + H2O}\]
When CO2 is bubbled through an aqueous solution of Ca(OH)2 the solution turns milky. It is used in whitewashing due to its disinfectant nature.
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