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Q.

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 white washing due to disinfectant nature. What is the chemical formula of A?

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a

CaHCO32

b

CaO

c

Ca(OH)2

d

CaCO3

answer is C.

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Detailed Solution

To recover NH3 in Solvay ammonia soda process Ca(OH)2 is used.2NH4Cl+Ca(OH)2⟶2NH3+CaCl2+2H2OOn passing CO2 through Ca(OH)2,it turns milky due to the formation of CaCO3 Ca(OH)2+CO2⟶CaCO3↓+H2OCa(OH)2 is used for white washing.

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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 white washing due to disinfectant nature. What is the chemical formula of A?