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State two ways to prevent the rusting of...

State two ways to prevent the rusting of iron.

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LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. A zinc ore gave CO(2) on treatment with a dilute acid. Identify the or...

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  2. What chemical process is used for obtaining a metal from its oxide?

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  3. State two ways to prevent the rusting of iron.

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  4. What is meant by galvanisation? Why is it done?

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  5. Name the metal which is used for galvanising iron.

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  6. Explain why,iron sheets are coatedwith zinc.

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  7. Why do we apply paint on iron articles?

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  8. Give reason for the following: Carbonate and sulphide ores are usual...

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  9. Name a reducing agent that may be used to obtain manganese from mangan...

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  10. Name an alloy of lead and tin.

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  11. Give the composition of an alloy called solder. State its one property...

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  12. what is an amalgam?

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  13. How many carats is pure gold ? Why is pure gold not suitable for makin...

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  14. Name one method for the refining of metals.

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  15. State two conditions for the rusting of iron.

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  16. In one method of rust prevention, the iron is not coated with anything...

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  17. Name two allys ofiron.what elements are present in these alloys?

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  18. Give reason for the following: Silver, gold and platinum are used to...

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  19. Which metal becomes black in the presence of hydrogen sulphide gas in ...

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  20. name the gas in air which tarnishes silver articles slowly.

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