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

Options

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

Answer

B

Explanation

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`