1.

What happens when aluminium and zinc salts react with an excess of NaOH

Answer»

White PRECIPITATE of formed
White precipitate of both Zn and Al first formed redissolve in EXCESS of `NAOH`
White precipitate of Al redissolves but of Zn does not
White precipitate of Zn redissolves and that of Al does not

Solution :Zinc salts and aluminium react with `NaOH` to FORM a white gelatinous precipitate of `Zn(OH)_(2)` and `Al(OH)_(3)` which then redissolve in excess of NaOH.
`Zn^(2+)+2OH^(-)rarr Zn(OH)_(2)`
`Al^(3+)+3OH^(-)rarr Al(OH)_(3)`


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