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Question

What happens when a piece of zinc metal is added to copper sulphate solution?

A
Decomposition reaction
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B
Displacement reaction
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C
Double displacement reaction
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D
Precipitation reaction
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Solution

The correct option is B Displacement reaction
When zinc metal is added to a solution of copper sulphate (CuSO4), the blue colour of the latter changes to colourless as zinc sulphate (ZnSO4) is formed.

In this displacement reaction, zinc being more active metal than copper displaces it to form zinc sulphate, as shown below:

Zn(s)+CuSO4(aq)ZnSO4(aq)+Cu(s)
(blue) (colourless)

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