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