Question

while doing an experiment a student observed that the blue colour of the aqueous copper sulphate solution was changed to pale green by immersing a metal rod in it which metal rod is immersed in it

Answer 1

iron metal rod was immersed in it

Answer 2

fe that is iron. when iron rod is immersed into aqueous copper sulphate solution fe displaces cu from cuso4 and changes into feso4 which is pale green in colour.

hope this answer helps uuu