1.

Which of the following compounds is used for water softening ?

Answer»

`Ca_3(PO_4)_2`
`Na_3PO_4`
`Na_6P_6O_18`
`Na_2HPO_4`

Solution :The SODIUM hexametaphosphate is used for water SOFTENING. Its MOLECULAR FORMULA is
`Na_2[Na_4 (PO_3)_6] = Na_6P_6O_18`
`2CaCl_2 + Na_2 [Na_4 (PO_3)_6] to Na_2 [Ca_2(PO_3)_6] + 4NaCl`


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