The reagent(s) used for softening the temporary hardness of water area) Ca3(PO4)2 b) Ca(OH)2c) Na2CO3d) 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
Temporary hardness of water is due to the presence of soluble bicarbonates of Ca & Mgi.e,. Ca(HCO3)2 Ag(HCO3)2The 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.