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Question

A chemical (A) is used for water softening to remove temporary hardness. (A) reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through the solution of (A), it turns cloudy. What is the chemical formula of (A)?

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

The correct option is C Ca(OH)2
Lime water (Ca(OH)2) is used to remove the temporary hardness of water.
Ca(OH)2 reacts with bicarbonates of Ca and Mg to form insoluble carbonates.

Ca(HCO3)2(aq)+Ca(OH)22CaCO3(insoluble)+2H2O

Mg(HCO3)2(aq)+Ca(OH)2CaCO3(insoluble)+MgCO3(insoluble)+2H2O

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