Metals and Non-metals Past Paper PDF 2024-25

8. In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte? 9. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below. (a) W...

8. In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte? 9. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below. (a) What will be the action of gas on (i) dry litmus paper? (ii) moist litmus paper? (b) Write a balanced chemical equation for the reaction taking place. 10. State two ways to prevent the rusting of iron. 11. What type of oxides are formed when non-metals combine with oxygen? 12. Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually converted into Collection of gas oxides during the process of extraction. 13. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels. 14. Differentiate between metal and non-metal on the basis of their chemical properties. 15. A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used? 16. Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron). Metals and Non-metals 57 2024-25