1.

Which of the following pairs of ions when mixed in dilute solutions may be precipitate

Answer»

`Na^(+),SO_(4)^(2-)`
`NH_(4)^(+),CO_(3)^(2-)`
`Na^(+),S^(2-)`
`Fe^(3+),PO_(4)^(3-)`

SOLUTION :`Fe_(3)(PO_(4))_2` is INSOLUBLE in water.


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