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Q.

The reagent(s) used for softening the temporary hardness of water are
a) Ca₃(PO₄)₂
b) Ca(OH)₂
c) Na₂CO₃
d) NaOCl

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a

Only a & b

b

Only b & d

c

Only b & c

d

Only a & d

answer is C.

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Detailed Solution

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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.

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The reagent(s) used for softening the temporary hardness of water area) Ca3(PO4)2 b) Ca(OH)2c) Na2CO3 d) NaOCl