Chemistry · May / June 2016 · Paper 12 · Question 1

Which row correctly identifies the gas?

Agas: Cl2; test: damp litmus paper; observation: the litmus paper turns blue
Bgas: NH3; test: damp litmus paper; observation: the litmus paper turns red
Cgas: O2; test: limewater; observation: no change is observed
Dgas: SO2; test: acidified aqueous potassium manganate(VII); observation: the colour of the solution changes from purple to colourless

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Correct answer: D. gas: SO2; test: acidified aqueous potassium manganate(VII); observation: the colour of the solution changes from purple to colourless

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