Chemistry · Oct / Nov 2016 · Paper 11 · Question 2

Two experiments were carried out. In experiment 1, ammonium carbonate was reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonate was heated with aqueous sodium hydroxide. In each experiment, the gas evolved was tested with damp blue litmus paper and damp red litmus paper. [diagrams of experiment 1 and experiment 2] Which row correctly shows the colour of both the pieces of litmus paper at the end of each experiment?

1. Aexperiment 1: blue, experiment 2: blue
2. Bexperiment 1: blue, experiment 2: red
3. Cexperiment 1: red, experiment 2: blue
4. Dexperiment 1: red, experiment 2: red

As printed in the paper