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Chemistry
3. Metals and Non-metals
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Q14 of 79 Page 3

State two ways to prevent the rusting of iron.

(i) Rusting of iron can be prevented by galvanization. In this process, iron articles are coated with a thin layer of zinc metal which prevent the iron to come in contact with air and moisture. Hence, rusting is prevented.

(ii) Rusting of iron can be prevented by applying oil, grease, or paint. These are applied all over the surface of iron object to keep the air and moisture away.

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12

Show the electronic transfer in the formation of MgCl2 form its elements.

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.

15

What are amphoteric oxides? Give two examples of amphoteric oxides.

16

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 metals based on properties shown by these tests.

Questions · 79
3. Metals and Non-metals
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