Which mixture is separated by conc. Aqueous solution of sodium hydroxide:-

Options

A. `Al^(3+) and Sn^(2+)`
B. `Al^(3+) and Fe^(3+)`
C. `Al^(3+) and Zn^(2+)`
D. `Zn^(2+) and Pb^(2+)`

Answer

B

Explanation

`Al^(3+),Sn^(2+),Zn^(2+)` and `Pb^(+)` forms solube salts in excess of conc. NaOH solution but `Fe^(3+)` forms a precipitate of `Fe(OH)_(3)`