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Which one of the following statement is ...

Which one of the following statement is false ?

A

During roasting , moisture is removed from the ore

B

The ore is free from almost all non-metallic impurities

C

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

D

The concentrated zinc blende is subjected to calcination during the extraction by pyrometallurgy

Text Solution

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The correct Answer is:
D
Zinc blende is heated in a regular supply of air in a furnance at a temperature below the melting point of the metal (roasting ) . `2ZnS +3O_2 to 2ZnO+ 2SO_2 `
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Exercise 2
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  2. Which of the following statement(s) is/are incorrect ? I. Zinc can b...

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  3. Match Column I with Column II and select the correct answer using the ...

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  4. Consider the following reaction at 1000^(@)C (A) Zn (s) + (1)/(2) O...

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  5. In Mac Arthur Forest method, silver is extracted from the solution of ...

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  6. Which method of purification is represented by the following equations...

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  7. In aluminium extraction by Bayer process, alumina is extracted from ba...

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  8. Which of the following statement is incorrect?

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  9. Match the following Columns and choose the correct option from the cod...

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  10. Aluminothermic process is used for the extraction of metals, whose oxi...

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  11. Match the column I and column II and pick the correct matching from th...

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  12. To obtain pure germanium which of the following methods of refining is...

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  13. Which one of the following statement is false ?

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  14. Cabon cannot reduce Fe(2)O(3) to Fe at a temperature below 983K becaus...

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  15. Cassiterite is an ore of I... and is concentrated by II.... method . ...

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  16. In the isolation of metals, reaction proces susually results in

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  17. Gravity separation method is based upon:

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  18. Hydro-metallurgical process of extraction of metals is based on

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  19. (Ag +Pb) alloy overset("Melt and add zinc")rarr (Ag +Pb +Zn) "melt" ov...

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  20. Purest form of commercial iron is :

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