Chemistry · May / June 2016 · Paper 11 · Question 2

Four gas jars each contain one of the gases ammonia, chlorine, hydrogen chloride and oxygen. A strip of damp blue litmus paper and a strip of damp red litmus paper are placed in each jar. In which gas jar will both the damp blue litmus paper and the damp red litmus paper change colour?

1. Aammonia
2. Bchlorine
3. Chydrogen chloride
4. Doxygen

As printed in the paper