1.

In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with bothaqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide?

Answer»

`PB^(2+), CU^(2+)`
`Zn^(2+), Al^(3+)`
`Cu^(2+), Zn^(2+)`
`Al^(3), Cu^(2+)`

Solution :`Zn^(2+)` ion reacts with aq. NAOH and `NH_(3)` and FORMS a coordination compound.
`Zn^(2+)+4NaOH RARR [Zn(OH)_(4)]^(2-)+4Na^(+)`
`Zn^(2+)+4NH_(3) rarr [Zn(NH_(3))_(4)]^(2+)`
But, `Al^(3+)` ion reacts only with NaOH.
`Al^(3)+4NaOH rarr [Al(OH)_(4)]^(-)+4Na^(+)`


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