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Q.

The sulphide ores are first converted into their metal oxides before they get reduced into metals by carbon. This is because,

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a

Metal oxides have lower melting points than metal sulphides

b

All metal sulphides are unstable beyond 1000 K 

c

metal sulphide is less reactive towards carbon than metal oxide 

d

metal oxides are stable

answer is D.

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Detailed Solution

  • A metal oxide is generally less stable than the metal sulfide. 
  • Thus, reduction of metal oxide is easier than the reduction of metal sulfide. 
  • Hence, a sulfide ore is first converted into it's oxide before reduction. 
  • This process is known as roasting.
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