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Question

Polyphosphates are used as water softening agents because they


A

Form soluble complexes with anionic species

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B

Precipitate anionic species

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C

Forms soluble complexes with cationic species

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D

Precipitate cationic species

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Solution

The correct option is C

Forms soluble complexes with cationic species


Polyphosphates (sodium hexametaphosphates, sodium tripolyphosphate or STPP) from soluble complexes with Ca+2,Mg+2 present in hard water.


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