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Among the following statements the incoo...

Among the following statements the incoorect one is

A

Calamine and siderte are oxides

B

Argentite and cuprite are oxides

C

Zinc blende and iron pyrites are sulphides.

D

Malachite and azurite are ores of copper.

Text Solution

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The correct Answer is:
B
Magnesium is extracted by the electrolysis on fused salt `(MgCl_2)`
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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-SELECTED STRAIGHT OBJECTIVE TYPE MCQS
  1. Which of the following oxides is/are amphoteric ?

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  2. Extraction of metal from the ore cassiterite involves

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  3. The carbon-based reduction method is not used in the extraction of

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  4. In the metallurgical processes, aluminium acts as

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  5. Hydrogen will not reduce

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  6. Froth floatation process may be used to increase the concentration of ...

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  7. In which of the following mineral aluminium is not present ?

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  8. An important ore of magensium is

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  9. Among the following statements the incoorect one is

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  10. In the commercial electrochemical process for aluminium extraction, th...

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  11. Which of the following process is used in the extractive metallurgy of...

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  12. Pb and Sn are extracted from their chief ore by

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  13. Which of the following ores is best concentrated by froth floatation m...

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  14. During electrolytic refining of copper, some metals present as impurit...

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  15. Heating mixture of Cu(2)O and Cu(2)S will give

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  16. Sulphide ores of metals are usually concentrated by froth floatation p...

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  17. Which of the following statements, about the advantage of roasting of ...

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  18. Extraction of zinc blende is achieved by

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  19. Which of the following factors is of no significance for roasting sulp...

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  20. Native silver metal forms a water soluble complex with a dilute soluti...

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