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What happens when aluminium and zinc sal...

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

A

White precipitate is formed

B

White precipitate of both Zn and Al first formed redissolve in excess of NaOH

C

White precipitate of Al redissolves but that of Zn does not

D

White precipitate of Zn redissolves and that of Al does not

Text Solution

Verified by Experts

The correct Answer is:
B
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^(-) to Zn(OH)_2`
`Al^(3+) + 3OH^(-) to Al(OH)_3`
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