Q.

Chemical A is used for water softening to remove temperorary hardness. A reacts with sodium carbonate to generate caustic soda. When carbondioxide 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

answer is C.

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Detailed Solution

"A" is Ca(OH)2 (Slaked lime)/Lime water→ Ca(OH)2 is used for removal of temporary hardness of water   → Lime water turns CO2 to cloudy (or) white turbidity. cloudy appearance is due to the formation of CaCO3
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