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?

Options

A. `Ca(HCO_(3))_(2)`
B. `CaO`
C. `Ca(OH)_(2)`
D. `CaCO_(3)`

Answer

C

Explanation

`Ca(OH)_(2)` is used in solvay process i.e., preparation of washing soda `(Na_(2)CO_(3)*10H_(2)O)` to recover `NH_(3)`.
`2NH_(4)Cl+ undersete('A')(Ca(OH)_(2))to 2NH_(3)+CaCl_(2)+H_(2)O`
`underset('A')(Ca(OH)_(2))+CO_(2) to underset("Milkiness")(CaCO_(3)darr)+H_(2)O`
`Ca(OH)_(2)` is used in white washing due to its disinfectant nature.