Question

Two test tubes are taken and labelled A and B. About 10 ml of copper
sulphate solution was added to both the test tube. Two iron nails that
were cleaned by rubbing with sand paper were immersed into test
tube B and left undisturbed for 20 min.
Compare the intensity of the blue colour of copper sulphate solutions
in test tubes (A) and (3). Also, compare the colour of the iron nails
dipped in the copper sulphate solution with the one kept aside.



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Answer 1

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