Chemical Effects of Current  Class 8 - Science  (Worksheet) Q1: Fill in the blanks a. If electrodes are immersed in water and current is passed, bubbles of ________ and _______ are produced. b. A coating of ______ is deposited on the iron to protect it from corrosion and formation of rust. Q2: Circuit of the tester may be complete yet the bulb may not glow. Why? Answer: