Discussion Forum



1)

Which of the following oxides can act both as an oxidising agent as well as a reducing agent?


A) $N_{2}O$

B) $SO_{2}$

C) $SO_{3}$

D) $P_{2}O_{5}$

Answer:

Option B

Explanation:

$SO_{2}$ oxides can act both as an oxidising agent as well as a reducing agent. It behaves as a reducing agent in moist conditions. It converts iron (III) ions to iron (II) ions and decolourises acidified potassium permanganate(VII) solution.

$2 Fe^{3+}+ SO_{2}+2H_{2}O\rightarrow2Fe^{2+}+SO_{4}^{2-}+4H^{+}$

 when SO2 reacts with H2S, it produces sulphur and water. In this reaction, 'SO2' act as an oxidising agent.

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