An experiment test of the Law of conservation of Mass is illustrated in the diagram....

JAMB 1978

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

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Correct Answer: Option E

Explanation

Option E won't be suitable because it contains HCl (acid) and Sodium carbonate ( Carbonate) which will liberate CO\(_2\). Hence the mass of the product will not be same as the mass before the reaction.

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