paper acidified with dilute turns green when exposed to:

Question

paper acidified with dilute  turns green when exposed to:

Canvas Classes · Accepted Answer

Concept: Oxidising action of

Acidified  (orange) is a strong oxidising agent. When it oxidises a reducing agent,  is reduced to  (green).

Reaction with :

-  (orange) →  (green) ✓
-  (+4) →  (+6) — oxidised

Why others don't cause this:
- : not a reducing agent
- : not a reducing agent (already in +6 state)
- : is a reducing agent but turns the paper yellow/turbid (S deposits), not green

Answer: Option (4) — Sulphur dioxide

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