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Extraction of Metals

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Q.

Flux is used to remove ________

Q.

Which ore contains both iron and copper?

Q.

Bauxite ore is concentrated by ________

Q.

Four metals and their methods of refinement are given

(i) Ni, Cu, 

(ii) Electrolysis, van-Arkel process, Zone refining, Mond’s process

Choose the right method for each

Q. Carbon reduction cannot be complyed for extraction of Al from Al2O3 because?

Aluminum cannot be obtained by reducing its ore, i.e., alumina with coke. This is because alumina is a highly stable oxide and aluminum has high affinity for oxygen. Hence coke cannot reduce alumina to aluminum metal itself getting converted to carbon dioxide.

Q. Which process is used in extractive metallurgy of magnesium?

electrolysis

Q. In the commercial electrochemical process for aluminum extraction, the electrolyte used is?

Al2O3 mixed with cryolite Na3[AlF6] is fused and electroysed in extraction of Al.