Question

14. When sulphur dioxide gas is passed through acidified potassium dichromate solution, the colour of the
solution changes from:
(1) orange to yellow
(2) orange to green
(4) yellow to green
(3) green to orange
​

Answer 1

Answer:

When SO2 is passed through the acidified K2Cr2O7 solution, the orange colour of potassium dichromate solution turns to clear green due to the formation of chromium sulphate. In this reaction, the oxidation state of Cr changes from +6 to +3. The appearance of green colour is due to the reduction of chromium metal.

ii.orange to green

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