A colourless aqueous solution on adding ...

A colourless aqueous solution on adding water and on heating gave a white precipitate. The precipitate when reacted with `NH_(4)Cl` and `NH_(4)OH` in excess resulted in dissolution of some of the precipitate and a gelatinous precipitate is obtained. What is the hydroxide formed in aqueous solution?

`Zn(OH)_(2)`

`Mg(OH)_(2)`

`Al(OH)_(3)`

`Ca(OH)_(2)`.

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The correct Answer is:

`Al(OH)_(3)` is a gelatinous precipitate.

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