1.

Mg_(3)N_(2)(s)+H_(2)O overset(R.T.)to P darr+Q uarr Excess 'Q' gas does not form coloured complex with:

Answer»

`Ni^(2+)(AQ.)`
`Zn^(2+)(aq.)`
`Cr^(3+)(aq.)`
`Cu^(2+)(aq.)`

Solution :`Mg_(3)N_(2)(s)+H_(2)O overset(R.T.)to underset(P)(Mg(OH)_(2)darr)+underset(Q)(NH_(3))uarr`
`underset((3D^(10)4s^(0)))(overset(+II)(Zn)(aq.))+4NH_(3) hArr underset(("colourless complex ion"))([Zn(NH_(3))_(4)]^(2+))`


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