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Standard XII

Chemistry

Cyanide or Macarthur Forrest Process

In the cyanid...

Question

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

O_{2}

and

C O

respectively

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O_{2}

and

Z n

dust respectively

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H {N O}_{3}

and

Z n

dust respectively

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H {N O}_{3}

and

C O

respectively

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Solution

The correct option is B $O_{2}$ and $Z n$ dust respectively
Silver ore is oxidised by using oxygen from air $4 A g + 8 N a C N + 2 H_{2} O + O_{2} ⟶$ $4 N a [A g (C N_{2})] + 4 N a O H$

In this Ag(0) is oxidized to Ag (+ 1), Silver is precipitated from the solution by addition of $O_{2}$ .
$2 N a [A g (C N_{2})] +$ Zn $⟶$ $N a_{2} [Z n ({C N}_{4})] + 2 A g$ $↓$
Silver gets reduced from Ag (+1) to Ag (0) by the addition of Zn powder.

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Similar questions

Q. In cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents are respectively.

Q. Assertion :In cyanide process for the extraction of gold and silver from their native ores, the cyanide solution acts as a reducing agent to reduce the gold and silver compounds present in the ores into the metallic states. Reason: In the extraction of gold and silver, the cyanide solution acts as complexing reagent in the presence of air and form their respective soluble complexes.

Q. Zn reacts with dilute

H N O_{3}, C o n c . H N O_{3}

and very dilute

H N O_{3}

. The oxidation number of nitrogen changes from

H N O_{3}

are

a, b, c

in product

X, Y, Z

respectively. What is the value of

(a + b + c)

is
(a)

Z n + H N O_{3} \to Z n (N O_{3})_{2} + " X " + H_{2} O

dilute (

20 %

)
(b)

Z n + H N O_{3} \to Z n (N O_{3})_{2} + " Y " + H_{2} O

Conc (

70 %

)
(a)

Z n + H N O_{3} \to Z n (N O_{3})_{2} + " Z " + H_{2} O

very dilute (

6 %

)

Q. Consider the following reactions,
(I)

Z n + d i l . H_{2} S O_{4} \to Z n S O_{4} + H_{2}

(II)

Z n + c o n c . H_{2} S O_{4} \to Z n S O_{4} + S O_{2} + H_{2} O

Oxidising agents in

I

and

I I

are _______ respectively

Q. Extraction of silver is achieved by initial complexation of the ore (Argentite) with

X

followed by reduction with

Y . X

and

Y

, respectively, are:

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