Question

Which of the following anions are identified by $dil.H_{2}S{O}_4$?

(i) $C{O}_3^{2-}$ (ii) $S{O}_3^{2-}$ (iii) $S_2{O}_3^{2-}$ (iv) $N{O}_3^{2-}$ (v) $I^{\ominus }$ (vi) $C_2{O}_4^{2-}$

• A. $C{O}_3^{2-}$, $S{O}_3^{2-}$, $N{O}_3^{2-}$, $S_2{O}_3^{2-}$
• B. $S{O}_3^{2-}$, $S_2{O}_3^{2-}$, $I^{\ominus }$, $N{O}_3^{2-}$
• C. $C{O}_3^{2-}$, $S{O}_3^{2-}$, $S_2{O}_3^{2-}$
• D. $C{O}_3^{2-}$, $S{O}_3^{2-}$, $N{O}_3^{2-}$, $C_2{O}_4^{2-}$

Answer 1

Answer: (C)

$C{O}_3^{2-}$, $S{O}_3^{2-}$, $S_2{O}_3^{2-}$

Option (C) is correct.
$C{O}_3^{2-}$, $S{O}_3^{2-}$, $S_2{O}_3^{2-}$ anions are identified by $dil.H_{2}S{O}_4$
$N{O}_3^{2-}$,$I^{-}$,$C_2{O}_4^{2-}$ anions are identified by $conc.H_{2}S{O}_4$