One day Mohan was performing an experiment in the laboratory. By mistake he leaves the iron nail in the copper sulphate solution for one week. After one week, the colour of sulphate solution is:

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Yellow

Colourless

Red

Green

answer is A.

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Detailed Solution

It is a displacement reaction in which iron displace copper from copper sulphate solution and changes colour from blue to green due to the formation of Iron sulphate (Ferrous soulphate,

F e S O_{4}

)

$F e_{(s)} + \underset{(B l u e)}{C u S O_{4 (a q)}} \to \underset{(p a l e g r e e n)}{F e S O_{4 (a q)}} + C u_{(s)}$

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