High purity germanium is obtained by a technique that is based on:

Important Questions on General Principles and Processes of Isolation of Metals (Metallurgy)

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 37

Sapphire is a mineral of:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 43

In which of the following pair of metals, both are commercially extracted from their respective ores by self reduction method?

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 45

Consider the following statements:
${\mathrm{S}}_1:$ In the extraction of iron from haematite ore, the reduction reactions take place only in the lower temperature range in the blast furnace.
${\mathrm{S}}_2:$ Calamine is a carbonate ore of zinc.
${\mathrm{S}}_3:$ The principal ore of aluminium, bauxite, usually contains silica, iron oxides, and titanium oxide as impurities.
${\mathrm{S}}_4:$ The solidified copper obtained from silica lined converter (Bessemer converter) has a blistered appearance due to the evolution of ${\mathrm{SO}}_2$ and arrange in the order of true/false.

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 48

Select the correct statement:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 49

The reaction(s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore is (are):

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 50

Which of the following is a correct statement?

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 51

Froth floatation:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 52

Which of the following reduction reactions are actually employed in the commercial extraction of metals?