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Which one of the following statements is...

Which one of the following statements is false?

A

During roasting, moisture is removed from the ore

B

Cementite is the hardest variety of iron

C

Calcination of ore is carried out in the absence of blast of air

D

The concentrated zinc blende is subjected to calcination during its extraction by pyrometallury.

Text Solution

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The correct Answer is:
D
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MTG GUIDE-GENERAL PRINCIPALS AND PROCESSES OF ISOLATION OF ELEMENTS-Check Your NEET/ITALS
  1. Consider the following reactions at 1000^(@)C, I. Zn((s)) + (1)/(2) ...

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  2. A sulphide ore is generally roasted to the oxide before reduction, bec...

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  3. Carbon cannot be used in the reduction of Al(2)O(3) because

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  4. Identify x, y, z for the following metallurgical process.Metal sulphid...

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  5. Refining of impure copper with zinc impurity is to be done by electrol...

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  6. Which of the following ores is nto a sulphide ore?

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  7. Which of the following ores is not concentrated by electromagnetic sep...

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  8. Which of the following reaction is an example of calcination process?

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  9. During the extraction of Cu in the blast furnace at the roasting step

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  10. Which of the following reactions is not taking place during the extrac...

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  11. Which of the following represents the thermite reaction?

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  12. Which one of the following statements is false?

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  13. The underlining of blast furnace is made of

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  14. Aluminium is prepared in large quantities by

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  15. Silver is precipitated from an aqueous solution of sodium argentocyani...

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  16. Which of the following statements about electrolytic refining of silve...

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  17. Match the Column I with Column II and select the correct option

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  18. Match the Column I with Column II and select the correct option

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  19. Composition of azurite mineral is

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  20. The process of pickling is to

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