`H_(2)S` acts only as reducing agent while `SO_(2)` can act both as a reducing agent and as an oxidising agent. How will you account for it ?

Which can act as a reducing agent ?

Explain why HNO_(3) acts only as oxidising agent while HNO_(2) can act both as a reducing agent and an oxiding agent?

Explain the following : (a) An acidified K_2 Cr_2 O_7 paper turns green when exposed to SO_2 . (b) H_2 S acts only as reducing agent while SO_2 can act both as a reducing agent and an oxidising agent. (c) SO_2 acts as a bleaching agent. (d) Sugar turns black on addition of conc. H_2 SO_4 . (e) Ozone destroys mercury meniscus. (f) SF_6 is known, but SH_6 is not known.

Which substance can act only as a reducing agent ?

In which reaction H_(2)O_(2) acts as reducing agent ?

Assertion (A): HNO_(3) acts only as an oxidising agent, while HNO_(2) acts both as an oxidising agnet and a reducing agent. Reason (R ): The oxidation number of N in HNO_(3) is mximum.

H_(2)O_(2) acts as an oxidising agent in

Which of the following can only acts as oxidising agent ?