When a piece of zinc
metal is placed in a solution of mercuric chloride (HgCl2), a white
layer of mercury is deposited on zinc metal to give it silvery shining look.
This is because mercury is lower to zinc in reactivity series and hence, zinc
can displace mercury from HgCl2.
zinc is placed in a solution of magnesium sulphate, there is no change. This is
because magnesium is above zinc in the reactivity series and hence, zinc cannot
displace magnesium from its salt solution.
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