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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
Leaching involves the treatment of the ore with a suitable reagent so as to make it soluble while impurities remain insoluble. Leaching of gold is done with the help of their dissolution in `NaCN or KCN` or Cu with the help of `H^(+)` or Fe scrap .
`4Au(s)+8CN^(-) +O_(2)(g) +2H_(2)O to 4[Au(CN)_(2)]^(-)+4OH^(-)`
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Knowledge Check

  • Name the reagent used in this reaction.

    A
    `HNO_3`
    B
    HF
    C
    `H_2O`
    D
    `SO_2`

  • The chemical reagent used for leaching of gold and silver ores is

    A
    Soidum hydroxide
    B
    Potassium cyanide
    C
    Potassium cyanide
    D
    Sodium thiosulphate.

  • Reagent used is :

    A
    `Hg(OAC)_(2)//NaBH_(4).NaOH`
    B
    `BH_(3).THF//H_(2)O_(2).NaOH`
    C
    `LiAIH_(4)//H_(2)O`
    D
    All of these