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

To recover `NH_(3)` in Solvay ammonia soda process `Ca(OH)_(2)` is used.
`2NH_(4)Cl+Ca(OH)_(2)to2NH_(3)+CaCl_(2)+2H_(2)O`
On passing `CO_(2)` through `Ca(OH)_(2)`. It turns milky due to the formation of `CaCO_(3)`
`Ca(OH)_(2)+CO_(2)toCaCO_(3)darr+H_(2)O`
`Ca(OH)_(2)` is used for white washing.