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
