1.

which of the following salts used I the bead test for basic radicals?

Answer»

`Na(NH_(4))HPO_(4). 4H_(2)`
`Na_(2)HPO_(4)`
`(NH_(4))_(2)SO_(4). FeSO_(4). 6H_(2)O`
`(NH_4)_(2)HPO_(4).2H_(2)O`

Solution :`Na(NH_4)HPO_4 . 4H_2O` is known as MICROCOSMIC salf which on heating produces a transparent bead of sodium METAPHOSPHATE (`NaPO_3)`.
`Na(NH_4)HPO_(4) . 4 H_2O overset(Delta)(rarr)NH_3 + 5H_2O + NaPO_3`
The bead combines with certain coloured metallic oxides to form coloured beads of the corresponding orthophosphates.
`NaPO_3 + CuO to underset("Blue")(CuNaPO_4)`
It is, THEREFORE, sometimes used in PLACE of borax for PERFORMING bead test for coloured basic radicals.


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