Choose the correct statement:

The reason for use of polyphosphates as water softening agents is, that

  1. A

    they form soluble complexes with anionic species

  2. B

    they precipitate out cationic species

  3. C

    they precipitate out anionic species

  4. D

    they form soluble complexes with cationic species

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    Solution:

    Polyphosphates (e.g., sodium hexa metaphosphate) form soluble complexes with cations such as Ca2+ Mg2+and so they are used as water softening agents. 
     

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