Iron nails were dipped in an aqueous solution of copper sulphate. After about 30 minutes, it was observed that the colour of the solution changed from

1. Colorless to light green.
2. Blue to light green.
3. Blue to colourless.
4. Green to blue.

Correct answer: (b) 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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Updated on: 10-Oct-2022

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