JAMB - Chemistry (1981 - No. 40)
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
both gases change the colour of the solution from yellow to colourless
both gases causes sulphur to be deposited
only hydrogen sulphide decolourizes the solution
only sulphur dioxide deposits sulphur
only hydrogen sulphide deposits sulphur