(i) Name the method of refining of metals such as Germanium.
(ii)In the extraction of Al, impure Al₂O₃ is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
(iii)What is the role of coke in the extraction of iron from its oxides?

Solution

(i) Zone refining method is the most suitable method for refining metals like germanium (semiconductor).

(ii) In the extraction of aluminium, impure Al₂O₃ is dissolved in concentrated NaOH to form NaAlO₂.
This method is known as leaching of alumina.

$Al subscript 2 straight O subscript 3 left parenthesis straight s right parenthesis space plus 2 space NaOH space left parenthesis aq right parenthesis space plus 3 straight H subscript 2 straight O space left parenthesis straight l right parenthesis space rightwards arrow 2 Na left square bracket Al left parenthesis OH right parenthesis subscript 4 right square bracket$
(iii) Coke reduces the iron oxide to molten iron metal. Also, coke, when burnt in the blast furnace, supplies the heat required for carrying out the extraction of iron from its oxide.
FeO +C ---> Fe +CO

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

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General Principles And Processes Of Isolation Of Elements

(i) Name the method of refining of metals such as Germanium.
(ii)In the extraction of Al, impure Al₂O₃ is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
(iii)What is the role of coke in the extraction of iron from its oxides?

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

Why is zinc not extracted from zinc oxide through reduction using CO?

What is the role of graphite rod in the electrometallurgy of aluminium?

Predict conditions under which Al might be expected to reduce MgO.

Define the term gangue or matrix.

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General Principles And Processes Of Isolation Of Elements

(i) Name the method of refining of metals such as Germanium.(ii)In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?(iii)What is the role of coke in the extraction of iron from its oxides?

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

Why is zinc not extracted from zinc oxide through reduction using CO?

What is the role of graphite rod in the electrometallurgy of aluminium?

Predict conditions under which Al might be expected to reduce MgO.

Define the term gangue or matrix.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

(i) Name the method of refining of metals such as Germanium.
(ii)In the extraction of Al, impure Al₂O₃ is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
(iii)What is the role of coke in the extraction of iron from its oxides?