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Q.

When iron is dipped into the solution of copper sulphate, the colour of the solution of copper sulphate changes from:

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a

Blue to light green

b

Red to yellow

c

Colourless to blue

d

Colourless to white.

answer is A.

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Detailed Solution

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When iron is dipped into the solution of copper sulphate, the colour of the solution of copper sulphate changes from blue to light green.
When iron nails are dipped in a copper sulphate solution, a coating of copper is formed above the iron nails. And the colour of copper sulphate solution changes from blue to light green. In the reactivity series, iron is placed above the copper and it displaces copper from copper sulphate. Its reaction is given as

Fe (s) + CuS O_{4} (aq) \to FeS O_{4} (aq) + Cu (s)

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