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To verify the law of conservation of mas...

To verify the law of conservation of mass in a chemicl reaction four students A,B,C and D perfored the following chemicla reactions in the schoold laboratory.
Added zinc granules to dil hydorchlorica acid
(b) heated lead nitrate (solid) in a test tube
(c ) dipped mg ribbon in copper suphate solution
(d) added barium chloride solution to sodium suphate solution .
Which student according to you is likely to obtain the best results and why?

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student (D) is likely to obtain the best result because the reaction is completed immediately and a white precipitate is formed
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