Which of the following statement$\left(\mathrm{s}\right)$ is (are) true?

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

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 27

The role of fluorspar $\left({\mathrm{CaF}}_2\right)$ which is added in the electrolytic reduction of alumina dissolved in fused cryolite is (are)

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 28

Which of the following are correctly matched?

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 29

Which of the following statements are correct in connection with the extraction of silver?

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 31

$\mathrm{NaCN}$ used in the froth floatation method for the purification of ore is-

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 34

Autoreduction process is used in the extraction of

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 36

Out of the following, which ores are calcinated during extraction?
$\left(\mathrm{a}\right)$ Copper pyrites $\left(\mathrm{b}\right)$ Malachite $\left(\mathrm{C}\right)$ Bauxite
The correct answer is:

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 38

Carbon cannot be used in the reduction of ${\mathrm{Al}}_2{\mathrm{O}}_3$ because

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Beta Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>EXERCISE-2>Q 39

Which of the following reaction is not involved in the mite process?