First slide

Hardness of water

Question

Statement I: Temporary hardness can be removed by boiling hard water
Statement II : On boiling hard water bicarbonates of calcium and magnesium are converted to insoluble carbonates

Easy

A

Statement I and Statement II are true.
B

Statement I is true and statement II is false.
C

Statement I is false and Statement II is true.
D

Statement I and Statement II are false.

Solution

Temporary hardness of water is due to the presence of soluble bicarbonates of Ca & Mg
i.e,. Ca(HCO₃)2 Mg(HCO₃)₂
The temporary hardness of water is removed by 3-ways in all these 3-Process soluble bicarbonates converting into insoluble carbonates
(1) By boiling
(2) By heating with washing soda [Na₂CO₃ . 10H₂O]
(3) By clark's process: Reagent used in this process is Ca(OH)₂.
Statement I and Statement II are true.

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