Question

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Answer 1

Explanation:

1.Silver articles, when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide. Thus, a layer of silver sulphide is formed on the surface of silver articles, because of which they appear dull and black.

2.Colour of zinc sulphate solution is colourless.

Hence, Test tube 4 is ZnSo4 solution.

Reaction will take place in Zn /CuSo4 solution

Because zinc is more reactive than copper.Hence, zinc will take place of copper.

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