Which of the following metal cannot be extracted by carbon reduction process?

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-1>Q 43

In electrolysis of ${\mathrm{Al}}_2{\mathrm{O}}_3$ by Hall-Heroult process: 

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 44

During the electrolytic reduction of aluminium, the carbon anodes are replaced from time to time because:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 46

Aluminium metal is purified by:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 47

High purity copper metal is obtained by ________.

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 48

In the electrolytic refining of lead, $\mathrm{Sb}, \mathrm{Cu}, \mathrm{Ag}$ and $\mathrm{Au}$ are found:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 49

The anode mud in the electrolytic refining of silver contains:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 50

Silver can be separated from lead by:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-1>Q 51

The method of zone refining of metals is based on the principle of