Question

represent in an equation..
the chemical reaction between sulphur dioxide gas and acidified potassium dicromate solution is characterised by a change in colour from orange to green. ​

Answer 1

K2Cr2O7 + H2SO4 + 3SO2 ——— K2SO4 + Cr2(SO4)3 + H2O.

The orange-coloured dichromate solution will turn green due to the formation of chromium(III) sulphate, Cr2(SO4)3.

It is a redox reaction. Here:-

The oxidising agent is potassium dichromate and the reducing agent is sulphur dioxide.

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