Question

The hydroxide of which metal ion(s) which is/are soluble in excess of NaOH solution
A. `A1^(3+)`
B. `zn^(2+)`
C. `Fe^(3+)`
D. `Cu^(2+)`

Answer 1

Correct Answer - A::B
`2AI+underset("Excess")(2NaOH)rarr underset("Soluble")(2NaAIO_(2)+H_(2)`
`Zn+underset("Excess")(2NaOH)rarr underset("Soluble")(Na_(2)ZnO_(2)+H_(2)`