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Question

Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when CO2 is bubbled through 'A', it turns cloudy. Chemically 'A' is:

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

The correct option is D Ca(OH)2
Ca(OH)2 is used to remove temporary hardness of water.
Ca(OH)2+Ca(HCO3)22CaCO3+2H2O
Ca(OH)2+Na2CO3CaCO3+2NaOH
Ca(OH)2+CO2CaCO3+H2O
(Cloudy solution)
Hence, option D is correct

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