13. What type of oxides are formed when non-metals combine with oxygen? Given an example. 14. Sodium, potassium or lithium stored under kerosene oil. Give reason. 15. You are given a hammer, a battery, a bulb, wires and a switch. (a) How could you use them to distinguish between samples of metals and non-metals (b) Assess the usefulness of these tests in distinguish between metals and non-metals 16. Explain the term “Anodising” (or) Explain the extraction of mercury from cinnabar. Section – C2 x 5 = 10 17. Write the general properties of ironic compounds (or) (a) You must have seen tarnished copper vessel with lemon or tamarind juice. Explain why these source substance are effective in cleaning the vessels (b) Why does the silver anklet gets tarnished? 18. Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.
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Answer: 13. acidic and amphoteric oxides,
14. alkali is stored because it does not react with kerosene and hence sinks in it and does not react with components in the air
Explanation:
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