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In the cyanide extraction process of sil...

In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents are

A

`O_2` and `CO` respectively

B

`O_2` and `Zn` dust respectively

C

`HNO_3` and `Zn` dust respectively

D

`HNO_3` and `CO` respectively

Text Solution

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The correct Answer is:
B
Silver ore is oxidised by using oxygen from air :
`4Ag + 8 NaCN + 2H_2 O + O_2 ` (air)` to 4Na[Ag(CN)_2] + 4NaOH`
In this, `Ag(0)` is oxidised to `Ag(+1)` .
Silver is precipitated from the solution by addition of zinc powder.
`2Na[Ag(CN)_2] + Zn to Na_2 [Zn(CN)_4] + 2Ag`
SIlver gets reduced from `Ag(+1)` to `Ag(0)` .
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Ibn the cyanide extraction process of silver form aragetite are ,oxidizing and reduction agents used are action .

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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-COMPETION FILE (Objective Questions) (Multiple Choice Question from competitive examinations)
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  4. Which of the following is not a mineral of iron?

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  5. The one that is not a carbonate ore is:

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  6. Match the refining methods (Column I) with metals (Column II).

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  7. The correct statement is :

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  8. The pair that does NOT require calcination is :

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  9. The reaction that does NOT define calcination is :

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  10. Match the ores (Column A) with the metals (Column B) :

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  11. in the Hall -Heroult process, aluminium is formed at the athode , ...

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  12. The correct statement is

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  14. The ore that contains both iron and copper is :

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  15. Hall-Heroult's process is given by :

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  16. Extraction of zinc from zinc blende is achieved by:

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  17. Oxidation states of the metal in the minerals haematite and magnetite ...

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  18. In the cyanide extraction process of silver from argentite ore, the ox...

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  19. Sulphide ores are common for the metals

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