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Extraction of Copper

In order to r...

Question

In order to refine blister copper, it is melted in a furnace and is stirred with green logs of wood. The purpose is:

A

to expel the dissolved gases in blister copper

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B

to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood

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C

to bring the impurities to surface and oxidize them

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D

to increase the carbon content in copper

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Solution

The correct option is B to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood
The blister copper is melted in reverberatory furnace and stirred with poles of green wood. Any oxide of copper formed is reduced to metallic copper by the reducing hydrocarbons of the wood. The process is called fire refining or poling.

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Q. Blister copper is refined by stirring molten impure metal with green logs of wood because such wood liberates hydrocarbon gases (like

C H_{4}

). Name the process involved.

Q. Blister copper is refined by stirring molten impure metal with green logs of wood because such woods liberate gases (like

C H_{4}

). This process X is called , and it is used to purify the metal that initially contain impurities of the oxide Y. X and Y can be:

Q. The impurity present in Blister copper is:

S_{1} :

In electrolytic refining, the impurities from the blister copper deposits anode mud which contains antimony, selenium, tellurium, silver, gold and platinum. (from copper pyrites)

S_{2} :

The low grade ore of copper is leached with acid and is then treated with scrap iron or

H_{2}

S_{3} :

Siderite, curpite and argentite are oxide ores.

S_{4} :

Zone refining is very useful for producing semiconductor and other metals of very high purity, e.g., germanium, silicon, boron, gallium and indium.
Which of the following option is correct.
(T: True, F: False)

Q. Mark the correct statements:

(i) mercury can be refined by the process of distillation.

(ii) In poling, the molten impure metal is stirred with green poles of wood.

(iii) In electrolyte refining of metals, impure metal is made as cathode and a thin strip of pure metal is made as anode.

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