A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2010 · Q131 Mark

In aqueous solution, the acid HIO disproportionates according to the following equation where m, n, p and q are simple whole numbers in their lowest ratios. mHIO → nI₂ + pHIO₃ + qH₂O This equation can be balanced using oxidation numbers. What are the values for n and p?

An 1, p 2

Bn 2, p 1

Cn 4, p 1

Dn 4, p 2

✓ Correct answer

B: n 2, p 1

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2010 Paper 1 Variant 2, question 13.

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