• Take three iron nails and clean them by rubbing with sand paper.
• Take two test tubes marked as (A) and (B). In each test | tube, take about 10 ml copper sulphate solution.
• Tie two iron nails with a thread and immerse them 'carefully in the copper sulphate solution in test tube B for about 20 minutes [Fig. (a)]. Keep one iron nail aside for comparison.
• After 20 minutes, take out the iron nails from the copper sulphate solution.
• Compare the intensity of the blue colour of copper sulphate solutions in test tubes (A) and (B) (Fig. (b)].
Also, compare the colour of the iron nails dipped in the copper sulphate solution with the one kept aside [Fig. - (b)].


On the basis of activity , give the answers of th following questions :
What is the colour of copper sulphat solution in test tube A ?

Explanation

Blue colour.