Q. Aqueous solution of a salt (A) forms a dense white precipitate with $BaCl_2$ solution. The precipitate dissolves in dilute HCl to produce a gas (B) which decolourises acidified $KMnO_4$ solution
A and B respectively are :

KCETKCET 2020

Solution:

Answer (a) $BaSO_3, SO_2$

Next Question