Question

test the presence of sulphur dioxide​

Answer 1

Test tubes containing dilute acidified potassium manganate (VII) solution (left) and potassium manganate (VII) solution that has been decoloured by sulphur dioxide gas (right). As sulphur dioxide de-colours potassium manganate (VII) solution, this reaction can be used as a test for the presence of sulphur dioxide.

Answer 2

1 smell of rotten egg 2 and smell of burning hairs