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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Explanation:
option 2 is right.
because the solution of copper sulphate reacts with iron nail form ferrous sulphate which is light green in colour so the solution turns from copper sulphate which is blue in colour to ferrous sulphate which is green in colour
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