When an iron knife kept dipped in blue coppper sulphate solution turns blue solution into light green colour. Give reason?

When an iron knife kept dipped in blue coppper sulphate solution turns blue solution into light green colour. Give reason? If you are Looking for Answers of NIOS TMA OPEN BOARD/Nios 10th & 12th Class Solved Assignments (Tutor Marked Assignments) Please Contact us on 9643289714  (Call/WhatsApp) Important Links for Nios Open Board...