Question

Zinc pieces are added to acidified solution of `SO_(3)^(2-)`. Gas liberated can :
A. turn lead acetate paper black
B. turn lime water milky
C. give white precipitate with `AgNO_(3)` solution
D. None of these

Answer 1

Correct Answer - A
`SO_(3)^(2-)+Zn +8H^(+) to H_(2)S uarr + 3Zn^(2+)+3H_(2)O`
`Pb^(2+)+S^(2-) to PbS darr ("black")`
`Ag^(+)+S^(2-) to Ag_(2)S darr ("black")`