Question

Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that the blue colour of the solution has changed and a layer has deposited on iron filings. Which one of the following set of colours correspond to the colour of the solution and the colour of the coating respectively? *

Answer 1

Answer:

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Explanation:

The so formed copper gets deposited on the iron fillings due to which a brown or reddish-brown layer is formed over the black iron fillings. Thus after 10 minutes the color of the iron nail would be brown or reddish-brown.