1.

A solution when dilutedwith H_(2)O And bolled gives a white precipitate .On the additionof excess NH_(2)CINH_(4)OH the volumeof theprecipitatedecreases leavingg bebinda whitege3lationtiousprecipitateidentifytheprecipitatewhichdissolves in NH_(4)OH//NH_(4)Cl :

Answer»

`ZN(OH)_(2)`
`AL(OH)_(3)`
`Mg(OH)_(2)`
`Ca(OH)_(2)`

Solution :`Zn^(2+) + 2H_(2)O rarrunderset(WHITE)(Zn(OH)_(2) DARR)+ 2H^(oplus)`
`Zn(OH)_(2) + 2NH_(4)CI + 2NH_(4)OH rarr underset("soluble")([Zn(NH_(3))_(4)]CI_(2)) + 4H_(2)O`
`Zn(OH)_(2)` precipitatedissolvesin excess of `NH_(4)OH` in the presence of `NH_(4)CI` toformtetrqamine solublecomplex


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