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Roasting of copper pyrites is done:...

Roasting of copper pyrites is done:

A

to remove moisture and volatile impurities

B

to oxidise free sulphur

C

to decompose pyrites into `Cu_(2)S and FeS`

D

to decompose `Cu_(2)S` into blister copper

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The correct Answer is:
A, B, C
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VK JAISWAL ENGLISH-d-BLOCK ELEMENTS-ONE OR MORE ANSWER IS/ARE CORRECT
  1. Which of the following statements are true for Mohr's salt?

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  2. Which of the following statement(s) is/are correct?

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  3. Roasting of copper pyrites is done:

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  4. Identify the correct statements:

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  5. Which statements about mercury are correct?

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  6. Which statements about corrosive sublimate (HgCl(2)) are correct?

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  7. Identify the statement which is correct for copper sulphate

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  8. To an acidified dichromate solution,, a pinch of Na(2)O(2) is added an...

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  9. Pick out the correct statement(s):

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  10. The species that undergoes diproportionation in an alkaline medium are...

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  11. Which of the following statements regarding d block elements are true?

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  12. Which is/are insoluble in NH(3) solution?

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  13. Order of paramagnetic character among following element is/are"

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  14. Choose correct statements (s) regarding the following reactions. Cr(...

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  15. Mercuric chloride is converted into mercury by:

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  16. What changes occur when acidified Cr(2)O(7)^(2-) ion react with H(2)O(...

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  17. Choose correct statement(s) regarding the following reaction: Cr(2)O...

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  18. What changes occur when acidified Cr(2)O(7)^(2-) ion react with H(2)O(...

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  19. Mercury is a liquid metal because

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  20. An element of 3d-transition series two oxidation states x and y, diffe...

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