An experiment test of the Law of conservation of Mass is illustrated in the diagram. In practice, the flask is weighed before and after reaction between solutions X and Y. Which of the following pairs of solutions will be unsuitable for the experiments

• A X = hydrochloric acid; Y = silver nitrate
• B X = barium chloride; Y = dilute sulphuric acid
• C X = hydrochloric acid; Y = sodium hydroxide
• D X = hydrochloric acid; Y = lead nitrate
• E X = hydrochloric acid; Y = sodium carbonate