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Name a reducing agent that may be used t...

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

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Aluminium
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LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. Why do we apply paint on iron articles?

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

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

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  4. Name an alloy of lead and tin.

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

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  6. what is an amalgam?

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

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  8. Name one method for the refining of metals.

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  9. State two conditions for the rusting of iron.

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

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

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

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

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

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  15. Silver metal does not combine easily with oxygen but silver jewellery ...

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  16. Write the composition of the alloy called bronze. Give two uses of bro...

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  17. Why does a new aluminium vessel lose shine so soon after use?

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  18. Why do gold ornaments look new even after several years of use?

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  19. Name two metals which are highly resistant to corrosion.

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  20. Which property of 'solder' alloy makes It suitable for welding electri...

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