Question

In which of the following reactions, blue colour of
solution becomes colourless and a powdery red
mass is deposited at the bottom of the beaker?
(1) ZnSO4 + Fe → FeSO4 + Zn
(2) CuSO, + Zn → ZnSO4 + Cu
(3)CuSO, + Fe → FeSO, + Cu
(4) ZnSO + Cu → Cuso, + Zn​

Answer 1

Answer:

Explanation:

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In the second reaction

Answer 2

In the reaction, $CuSO_4+Fe\rightarrow FeSO_4+Cu$ , blue colour of solution becomes colourless and a powdery red mass is deposited at the bottom of the beaker.

Explanation:

Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

$CuSO_4+Fe\rightarrow FeSO_4+Cu$

Thus when iron when dropped into an aqueous solution of $CuSO_4$ , iron rdisplaces  copper from aqueous copper sulphate as iron is more recative than copper.

As $CuSO_4$ is blue in colour, when it changes to $FeSO_4$ and copper, the solution becomes colourless and a powdery red mass  of copper mass is deposited at the bottom of the beaker

Learn more about single displacement

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