1.

Al(OH)_(3) darr "(white)" + OH^(-) to [Al(OH)_(4)]^(-) soluble complex White precipitate of Al(OH)_(3) reappears when

Answer»

a solution of ammonium chloride is added
a solution of ammonia is added
concentrated `HNO_(3)` is added in excess
all of these

Solution :`underset("WHITE ppt")(Al(OH)_(3))+OH^(-) to underset("soluble")([Al(OH)_(4)]^(-))`
`[Al(OH)_(4)]^(-)+NH_(4)^(+) to Al(OH)_(3) darr +H_(2)O+NH_(3) uarr`


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