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Question

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 a solution of A, it turns cloudy. What is the chemical formula of A


A

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B

CaO

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C

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D

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Solution

The correct option is C


Ca(OH)2 removes temporary hardness in Clark’s process.

Ca(OH)2 + Na2CO3 ---> 2NaOH + CaCO3
Ca(OH)2+CO2----> CaCO3+H2O


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