Question

Which of the anions does not belongs to 1st group?

• A. Oxalate ion.
• B. Sulphite ion
• C. Acetate ion
• D. Carbonate ion

Answer 1

The correct option is A Oxalate ion.

Group $1$ anions are-

$C{O}_3^{2-},S^{2-},S{O}_3^{2-},N{O}_2^{-}$; they give positive test with dilute $H_{2}S{O}_4$.

Acetate $\left(C{H}_{3}CO{O}^{-}\right)$ ion and oxalate $\left(C_2{O}_4^{2-}\right)$ ion belongs to group $2$ and they give positive test with concentrated $H_{2}S{O}_4$.