1.

The reagents, NH_(4)Cl and aqueous NH_(3) will precipitate

Answer»

`Ca^(2+)`
`Al^(+3)`
`Mg^(2+)`
`Zn^(2+)`

Solution :`NH_(3)+H_(2)OtoNH_(4)OH` due to common ion effect `NH_(4)^(+)` ion CONCENTRATION INCREASES which leads to the precipitation of `Al(OH)_(3)`.


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