Q22 of 74 Page 189

How is the presence of SO2 detected?

When SO2 is passed through acidified potassium permanganate(VII) solution it decolourises the solution. This can be used for the detection of the SO2 gas. The below reaction represents the test,


5SO2 + 2MnO4- + 2H2O → 5SO42- + 4H+ + 2Mn2+


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20

What happens when sulphur dioxide is passed through an aqueous solution of Fe(III) salt?

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Comment on the nature of two S–O bonds formed in SO2 molecule. Are the two S–O bonds in this molecule equal?

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Mention three areas in which H2SO4 plays an important role.

 24

Write the conditions to maximise the yield of H2SO4 by

contact process.