Name of metal, M which is extracted based on the following equation,
$4 M + 8 {CN}^{-} + 2 H_{2} O + O_{2} \to 4 [M {(CN)}_{2}]^{-} + 4 {OH}^{-}$
$2 [M {(CN)}_{2}]^{-} + Zn \to {[Zn ({CN}_{4})]}^{2 -} + 2 M$

(a) Cu

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(b) Au

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(d) Ni

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Solution

The correct option is B
(b) Au

Leaching: It is a method of concentrating the ore based upon the differences between the chemical properties of the ore and the gangue.
Cyanide leach mining: cyanide ions bind to the gold and make them to soluble in water.
Extraction of gold: Gold $(Au)$ formed in the leaching step is treated with Zinc $(Zn)$ , then gold is extracted.
So, Gold is extracted by the cyanide process.

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Similar questions

Q. A metal 'M' has the electronic configuration 2, 8, 3 and occurs in nature as M

_{2}

_{4}

. It is more reactive than zinc. Name the ore from which this metal is extracted.

Q. Identify the metal

M

whose extraction is based on the following reactions:

M S + 2 O_{2} ⟶ M {S O}_{4}

2 M S + 3 O_{2} ⟶ 2 M O + 2 S O_{2}

M S + 2 M O ⟶ 3 M + S O_{2}

M S + M {S O}_{4} ⟶ 2 M + 2 S O_{2}

(a) What is the difference between a mineral and an ore?
(b) Which metal is extracted from cinnabar ore?
(c) Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
(d) How is sodium metal extracted? Explain with the help of the equation of the reaction involved.
(e) Name three other metal s which are extracted in a manner similar to sodium.

Q. Identify the metal M whose extraction is based on the following reactions:

M S + 2 O_{2} \to M S O_{4};

2 M S + 3 O_{2} \to 2 M O + 2 S O_{2}

M S + 2 M O \to 3 M + S O_{2};

M S + M S O_{4} \to 2 M + 2 S O_{2}

Q. Name the metals which are extracted from the following ores:
1. Pyrolusite 2. Bauxite . 3. haematite

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Name of metal, M which is extracted based on the following equation, 4M+8CN-+2H2O+O2→4[M(CN)2]-+4OH- 2[M(CN)2]-+Zn→[Zn(CN4)]2-+2M

Name of metal, M which is extracted based on the following equation,
$4 M + 8 {CN}^{-} + 2 H_{2} O + O_{2} \to 4 [M {(CN)}_{2}]^{-} + 4 {OH}^{-}$
$2 [M {(CN)}_{2}]^{-} + Zn \to {[Zn ({CN}_{4})]}^{2 -} + 2 M$