A piece granulated zinc was dropped into copper sulphate solution. After sometime the colour of the solution changed from blue to colourless. Why?

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Solution

Zinc is abone copper in the reactivity series. So, Zinc is more reactive than copper hece Zinc displace copper than its (Copper's) salt solution.
$C u S O_{4} + Z n ⟶ Z n S O_{4} + C u$
The colour of $C u S O_{4}$ solution was blue which changes to colourless due to formation of $Z n S O_{4}$ which is colourless.

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A piece granulated zinc was dropped into copper sulphate solution. After sometime the colour of the solution changed from blue to colourless. Why?

Zinc is abone copper in the reactivity series. So, Zinc is more reactive than copper hece Zinc displace copper than its (Copper's) salt solution.CuSO4+Zn⟶ZnSO4+CuThe colour of CuSO4 solution was blue which changes to colourless due to formation of ZnSO4 which is colourless.