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Chemical A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudly. What is the chemical formula of A

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(A) CaCO3

(B) CaO

(C) Ca(OH)2

(D) Ca(HCO3)2

Ans. C

Sol. In Clark’s method temporary hardness of water is removed by Ca(OH)2 and after passing CO2 it form milky colour solution.

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