Which of the following statements are correct for `SO_(2)` gas?
(a) It acts as bleaching agent in moist conditions.
(b) Its molecule has linear geometry.
(c ) Its dilute solution is used as disinfectant.
(d) It can be prepared by the reaction of dilute `H_(2)SO_(4)` with metal sulphide.

Answer

A, C

Explanation

(a) In moist condition `SO_(2)` gas acts as a bleaching agent.
e.g., it converts Fe (III)to Fe (II) ion and decolourises acidified `KMnO_(4)` (VII).
`2Fe^(3+)+SO_(2)+2H_(2)Oto2Fe^(2+)+SO_(4)^(2-)+4H^(+)`
(b) is incorrect it has bent structure.

(c ) Its dilute solution is used as a disinfectant.
(d) It can be prepared by the reaction of `O_(2)` with sulphide ore,
`4FeS_(2)+11O_(2)to2Fe_(2)O_(3)+8SO_(2)`
while metal on treatment with `H_(2)SO_(4)` produces `H_(2)S.
Hence, options (a) and (c) are correct choices.