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Which metal becomes black in the presenc...

Which metal becomes black in the presence of hydrogen sulphide gas in air?

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LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. Name two allys ofiron.what elements are present in these alloys?

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

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

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

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

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

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

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

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

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

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

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

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

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

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  15. How is manganese extracted from manganese dioxide, MnO(2)?Explain with...

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  16. What is a thermite reaction? Explain with the help of an equation.stat...

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  17. Which one of the methods given in column I is applied for the extracti...

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  18. (a) Give reasonwhy copper is used to make hot water tanksbut steel (an...

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  19. (a) Why does aluminium not corrode right through ? (b) What is meant...

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  20. (a) Why is an iron grill painted frequently? (b). Explain why, throu...

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