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An iron nail was dropped into copper sulphate solution. After some time, the colour of the solution changed from :- light green to blue
- blue to light green
- light green to colourless
- blue to yellow
Correct answer: (2)Blue to light green
Explanation: The iron nail gets covered with a red-brown coating of copper metal and the blue colour of copper sulphate solution changes to greenish as iron nail displaces copper from copper sulphate solution to form ferrous sulphate.
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