Which student reports that the solution turns green from blue colour?

[LokeshCBSE]

Student X puts Fe nails in CuSO₄ solution, while the other student Y puts Cu pieces in FeSO₄ solution. Which student reports that the solution turns green from blue colour?

[LokeshCBSE]

Fe displaces copper (Cu) from CuSO₄ solution and the solution turns green from blue colour.

Hence, student X would report that the blue solution turns green.