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A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. 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) $Ca{\left(HC{O}_{3}\right)}_{2}$                       (b) CaO

(c) $Ca{\left(OH\right)}_{2}$                           (d) $CaC{O}_{3}$