JEE Main Chemistry question

Polyphosphates are used as water softening agents because they

(A)Form soluble complexes with anionic species
(B)Precipitate anionic species
(C)Precipitate cationic species
(D)Form soluble complexes with cationic speciesCorrect

Answer: (D)

Solution

Polyphosphates (such as sodium hexametaphosphate/Calgon, sodium tripolyphosphate) soften hard water by binding the hardness-causing cations Ca and Mg into stable, soluble complex ions, keeping them in solution

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Question ID VK-137270