1.

Which of the following compounds is used to remove water hardens

Answer»

`Ca_(3)(PO_(4))_(2)`
`Na_(3)PO_(4)`
`Na_(6)P_(6)O_(18)`
`Na_(2)HPO_(4)`

Solution :`Na_(6)P_(6)O_(18)` (sodium METAPHOSPHATE) known as calgon is used for water softening


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