Question

Why the colour of copper sulphate changes when zinc metal is added?

Answer 1

Explanation -
Zinc is more reactive than copper. So, here , on adding zinc to CuSO4 solution, zinc displacescopper from copper sulphate & forms zinc sulphate solution. This is indicated by colour change from blue to colourless. CuSO4 solution has a blue colour while ZnSO4 solution is colourless.

Chemical equation -
Zn(s) + CuSO4(aq) -> Cu(s) + ZnSO4 (aq).

Type of reaction -

It's a displacement reaction.

It's a redox reaction. Oxidation number of Cu decreases from 2 to 0 so it's reduced. Oxidation number of Zn increases from 0 to 2 so it's oxidised.

Answer 2

the colour of copper sulphate solution changes when zinc is added to it because zinc is a highly reactive metal and so it displace copper from its salt and form zinc sulphate solution...



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