1.

A solution when diluted with H_(2)O and boiled, it gives a white precipitate. On addition of excess NH_(4)Cl//NH_(4)OH the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH_(4)OH//NH_(4)Cl

Answer»

`Zn(OH)_(2)`
`Al(OH)_(3)`
`Mg(OH)_(2)`
`CA(OH)_(2)`

SOLUTION :DUE to formation of tetraammine ZINC (II) complex, `Zn^(+2)+NH_(4)OH to [Zn(NH_(3))_(4)]^(+2)`


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