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  • Which of the following is used for softening hard water?
Multiple choice

Which of the following is used for softening hard water?

  1. (NaPO3)6

  2. Ca(NO3)2.NH4NO3

  3. Ca(H2PO4)2.+CaSO4.2H2O

  4. KNO3

  5. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because sodium hexametaphosphate is a polymeric salt of metaphosphoric acid. It is used for softening hard water under the trade name calgon.

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