An iron nail was dropped into copper sulphate solution. After some time, the colour of the solution changed from :
(1) light green to blue
(2) blue to light green
(3) light green to colourless
(4) blue to yellow

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Solution

Blue coloured copper sulphate solution on reaction with iron gives light green coloured iron sulphate.
$\underset{Blue}{{CuSO}_{4} (aq)} + \underset{Grey}{Fe (s)} \to \underset{Green}{{FeSO}_{4} (aq)} + \underset{Brown}{Cu (s)}$

Hence, the correct answer is option 2.

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An iron nail was dropped into copper sulphate solution. After some time, the colour of the solution changed from : (1) light green to blue (2) blue to light green (3) light green to colourless (4) blue to yellow

Blue coloured copper sulphate solution on reaction with iron gives light green coloured iron sulphate. CuSO4(aq)Blue+Fe(s)Grey→FeSO4(aq)Green+Cu(s)Brown Hence, the correct answer is option 2.

An iron nail was dropped into copper sulphate solution. After some time, the colour of the solution changed from :
(1) light green to blue
(2) blue to light green
(3) light green to colourless
(4) blue to yellow

Blue coloured copper sulphate solution on reaction with iron gives light green coloured iron sulphate.
$\underset{Blue}{{CuSO}_{4} (aq)} + \underset{Grey}{Fe (s)} \to \underset{Green}{{FeSO}_{4} (aq)} + \underset{Brown}{Cu (s)}$

Hence, the correct answer is option 2.