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In the laboratory, an aqueous solution of manganese(II) ions is oxidised by ________ to form ________. Choose the option that correctly fills both blanks.

1. Sulphate; Manganate
2. Peroxydisulphate; Manganate
3. Thiosulphate; Permanganate
4. Peroxydisulphate; Permanganate

Correct answer: Peroxydisulphate; Permanganate

Solution

In analytical chemistry, Mn²+(aq) is oxidised to the intensely violet permanganate ion MnO4⁻ using peroxydisulphate (persulphate) S2O8²- as the oxidising agent, often with an Ag⁺ catalyst. This is used as a qualitative test for Mn²+. Thiosulphate is a reducing agent, not an oxidiser. Sulphate has no oxidising power toward Mn²+ under lab conditions.

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