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Chemical A is used for water softening t...

Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When `CO_(2)` is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A ?

A

`CaCO_(3)`

B

CaO

C

`Ca(OH)_(2)`

D

`Ca(HCO_(3))_(2)`.

Text Solution

Verified by Experts

The correct Answer is:
C
`Ca(OH)_(2)` is used for the softening of temporary hard water.
`Ca(OH)_(2)(aq)+CO_(2)(g)tounderset("Cloudiness")(CaCO_(3)(s))+H_(2)O(l)`
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DINESH PUBLICATION-HYDROGEN-REVISION QUESTIONS FROM COMPETITIVE EXAMS.
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  12. Hydrogen behaves as an oxidising agent in its reaction with

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