A chemical A is used for the preparation of washing soda to recover ammonia. When C0₂ is bubbled through an aqueous solution of A, the solution tons milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
(a) Ca(C0₃)₂          
(b) CaO                   
(c) Ca(OH)₂
(d) CaC0₃

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