When sulphur dioxide gas is passed throught acidified potassium dichromate solution, the colour of the solution changes from:
When sulphur dioxide gas is passed throught acidified potassium dichromate solution, the colour of the solution changes from:
A. orange to blue
B. orange to green
C. green to orange
D. orange to colourless
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Correct Answer - B
`K_2Cr_2 O_7 + 4H_2SO_4 to K_2SO_4 + underset"Green"(Cr_2(SO_4)_3) + 4H_2O + 3[O]`
`SO_2 + [O] + H_2O to H_2SO_4`
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