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REVISION QUESTIONS – METALS AND ALLOYS 1. Place the following metals in order of reactivity. COPPER MAGNESIUM GOLD ALUMINIUM 2. Which ion gives a pink colour with ferroxyl indicator? A. OHB. Fe2+ C. Fe3+ D.Cu2+ 3. Which ion gives a blue colour with ferroxyl indicator? A. OHB. Fe2+ C. Fe3+ D.Cu2+ 4. Which of the following methods can give physical and sacrificial protection to iron? A. Painting B. Greasing C. Tin-plating D. Galvanising 5. Which of the following metals is found uncombined in the Earth’s Crust? A. Aluminium B. Iron C. Lead D. Silver 6. Hydrogen gas A. Burns with a pop B. Turns limewater milky C. Relights a glowing splint D. Turns pH paper red 7. Which two substances are required for the corrosion of iron? A. Water and nitrogen B. Water and oxygen C. Water and carbon dioxide D. Oxygen and nitrogen 8. Which metal will not react with dilute hydrochloric acid? A. Iron B. Magnesium C. Silver D. Zinc IRON 9. Which metal reacts vigorously with cold water? A. Aluminium B. Sodium C. Silver D. Tin 10. Magnesium is a reactive metal. It is extracted from its ore using A. Heat alone B. Electrolysis C. Heat and carbon D. A blast furnace 11. Which metal could be used as electrode X to produce the highest voltage? A. Copper B. Iron C. Lead D. Tin 12. Which of the following metals is an alloy? A. Brass B. Sodium C. Copper D. Iron 13. What is meant by a displacement reaction? 14. Write ion-electron equations for the following (a) oxidation of magnesium (b) reduction of zinc 15. What is meant by the term oxidation? 16. What is meant by the term reduction? 17. Explain why an ion bridge is necessary in a simple cell? 18. Why do batteries stop working? 19. Describe the reaction of Li, Mg, Cu, and Ag with oxygen, water and dilute acid. 20. Write the three equations that describe what is happening in the blast furnace. 21. Calculate the percentage by mass, of copper in copper oxide, CuO. 22. Write the ion-electron equation for the further oxidation of Fe2+(aq) ions in the rusting process. 23. Explain what would happen to the rate of rusting if a tin-plated iron can was scratched. 24. Explain what would happen if a galvanised steel bin was scratched.