May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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18Oxidation Reduction Redox EquationsMedium1 mark

The equation represents the reaction between sulfur dioxide and acidified potassium dichromate(VI).

3 S O_{2} + C r_{2} O_{7}^{2 -} + 2 H^{+} \to 3 S O_{4}^{2 -} + 2 C r^{3 +} + H_{2} O

What is oxidised and what is the oxidising agent in this reaction?

	oxidised	oxidising agent
A	Cr $_{2}$ O $_{7}^{2 -}$	H $^{+}$
B	Cr $_{2}$ O $_{7}^{2 -}$	Cr $_{2}$ O $_{7}^{2 -}$
C	SO $_{2}$	Cr $_{2}$ O $_{7}^{2 -}$
D	SO $_{2}$	H $^{+}$