Question

Aqueous solution of a salt $+MgS{O}_4$ solution $⟶$ no ppt. in cold $\stackrel{Heating}{\to }$ White ppt. appears.
The salt contains the acidic radical :

• A. $C{O}_3^{2-}$
• B. $HC{O}_3^{-}$
• C. $S{O}_3^{2-}$
• D. $C_2{O}_4^{2-}$

Answer 1

The correct option is B $HC{O}_3^{-}$

Option (B) is correct.
The salt contains the acidic radical $HC{O}_3^{-}$
$MgS{O}_4$ is added to the salt solution, white precipitate in cold indicates carbonate and white precipitate on heating confirms bicarbonate.