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Name the reagent that is used in leachi...

Name the reagent that is used in leaching of gold .

A

Carbon

B

Sodium cyanide

C

Carbon monoxide

D

Iodine

Text Solution

Verified by Experts

The correct Answer is:
B
Sodium cyanide
`4Au + 8NaCN + 2H_2O + O_2 to 4Na[Au(CN)_2] + 4NaOH`
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ERRORLESS-THE d-AND f- BLOCK ELEMENTS -NCERT BASED QUESTIONS (Compounds of Transitional Elements)
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  2. A copper coin is completely covered with a gold film and is placed in ...

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  3. Name the reagent that is used in leaching of gold .

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  4. A compound of Zinc which is white in cold state and yellow in hot stat...

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  5. White vitriol is

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  6. In the metallurgy of Zn the Zn dust obtained from roasting and reducti...

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  7. Zinc when reacted with excess of NaOH gives

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  8. Lucas reagent is ,

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  9. Zinc reacts with hot and concetrated H(2)SO(4) to give

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  10. Reduction of zinc with cold and very dilute nitric acid yields

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  11. What happens when aluminium and zinc salts react with an excess of NaO...

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  12. When calomel react with NH(4)OH solution the compound formed is

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  13. The formula of corrosive sublimate is

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  14. The main product obtained when a solution of sodium carbonate reacts w...

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  15. The gas produced on heating MnO(2) with conc. HCl is -

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  16. The number of moles of KMnO(4) required to oxidize one equivalent of K...

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  17. The charge required for the reduction of 1 mole of Cr(2)O(7)^(2-) ions...

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  18. In alkaline medium, the reaction of hydrogen peroxide with potassium p...

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  19. The major product formed in the oxidation of acetylene with alkaline K...

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  20. Upon heating with acidic KMnO4 an organic compound produces hexan – 1,...

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