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Reduction to ...

Question

Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.
Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process, the ore is mixed with carbon and heated in a suitable furnace
Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.
Self-reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in the air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

In the metallurgical extraction of zinc from ZnO, the reducing agent used is :

A

C O

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B

S O_{2}

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C

C O_{2}

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D

N O

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Solution

The correct option is B $C O$
In the metallurgical extraction of zinc from ZnO, the reducing agent used is C/CO.

$Z n O + C \to Z n + C O$
$Z n O + C O \to Z n + C O_{2}$

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Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.

Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process the ore is mixed with carbon and heated in suitable furnace

Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.

Self reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in air so asto convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

After partial roasting, the sulphide of copper is reduced by :

Q. (a) Name two metals which are found in free state in nature.
(b) What chemical process is used for extracting a metal from its oxide ore? Name one metal which is extracted by this method.
(c) Describe the extraction of zinc metal from its sulphide ore as well as its carbonate ore. Write equations of all the reactions involved.

Q. A metal M which is one of the best conductor of heat and electricity used in making electric wires is found in the nature as sulphide ore

M_{2} S

? Which process will be suitable for extraction of this metal M from its ore,

M_{2} S

? Write a balance chemical reaction involved in the process of extraction.

Q. Consider the metallurgical processes for extraction of metal

M_{1} and M_{2}

M_{1}

is heated with iodine in an evacuated vessel and metal iodide obtained is decomposed on a tungsten filament.

Process II : Sulphide ore of

M_{2}

is partially roasted until a part of it is converted to oxide and then further mixture is heated with more sulphide ore in absence of oxygen.

Among following metals

M_{1} and M_{2}

can be respectively:

Q. Consider the following statements and arrange in the order of true/false as given in the codes.

S_{1}

: In the aluminothermite process, aluminium acts as reducing agent.

S_{2}

: The process of extraction of gold involves the formation of

[A u (C N_{2})]^{-}

[Z n (C N)_{4}]^{2 -}

.

S_{3}

: In the extractive metallurgy of zinc, partial fusion of ZnO with coke is called smelting and reduction of ore to the molten metal is called smelting.

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