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Question

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,?

A
CaCO3
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B
Ca(HCO3)2
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C
CaO
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D
Ca(OH)2
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Solution

The correct option is D Ca(OH)2
Chemical A used in the preparation of washing soda Na2CO3 to recover ammonia is Ca(OH)2. It is a reaction involved in the Solvay
NH4Cl+Ca(OH)22NH3+CaCl2+H2O
Ca(OH)2+CO2CaCO3+H2O

CaCO3 gives milkiness,

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