Grade 7 Examination Portion coverage 3rd Term exam 21-22 and Answer Key
Grade 7 Chapter 7 Electrolysis Class Assessment 1. Loss of electron by an atom is called ………….? Oxidation b. Reduction c. Redox reaction 2. In ………… state of electrolytes, ions are not free to move? Liquid b. Solid c. Gas 3. Compounds that do not conduct electricity even in molten or solution form are called ……………….. ? a. Electrolytes b. Metal Electrode c. non-Electrolytes 4. Lead, Pb 2+ , gains -------- electrons forming lead atoms. a) 2 b) 4 c) 6 5. Metals donate electrons forming positive ions For example: a) Na + , K + , Ca 2+ , Al 3+ b) Cl - , Br - , I - , O 2- c) Both a & b 1. Lead as a metal will be collected on cathode. T 2. Bromine being a non-metal will be collected on anode. T 3. Aluminum is highly reactive metal. T 4. Oxygen react