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How many carats is pure gold ? Why is pu...

How many carats is pure gold ? Why is pure gold not suitable for making ornaments ?

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Pure gold is

List two properties of gold and silver which make them most suitable for making ornaments according to our need.

Which of the following acid is used by goldsmiths for cleaning gold and silver ornaments?

Gold has a molar mass of 197 g/mol. (a) How many moles of gold are in a 1.50 g sample of pure gold? (b) How many atoms are in the sample?

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LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. Give the composition of an alloy called solder. State its one property...

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  2. what is an amalgam?

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

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  4. Name one method for the refining of metals.

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  5. State two conditions for the rusting of iron.

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

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

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

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

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

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

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

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

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

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

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

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  17. Explain why, arbon cannot reduce oxides of sodium or magnesium.

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  18. Why are the metals like Na,K,Ca and Mg never found in their free state...

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  19. Name one metal each which is extracted by: (a). Reduction with carbo...

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  20. Fill in the following blanks with suitable words: ltbr. (a). The corro...

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