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General Principles And Processes of Isolation Of Elements

Short Answer Type

Which of the ores mentioned in Table 6.1. could be concentrated by magnetic separation method?
Table 6.1 Principal ores of some important metal.

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What is the significance of leaching in the extraction of aluminium?

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The reaction.
Cr₂O₃ + 2Al → Al₂O₃ + 2Cr (ΔG° = – 421 kJ)
is thermodyanmically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

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Is it true that under certain conditions. Mg can reduce Al₂O₃and Al can reduce MgO? What are those conditions?

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5. What is the role of depressant in froth floatation process?

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6.
Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Titanium is extracted from its ore, rutile - TiO₂. It is first converted into titanium(IV) chloride, which is then reduced to titanium using either magnesium or sodium. The ore rutile (impure titanium(IV) oxide) is heated with chlorine and coke at a temperature of about 1000°C.

It could not be extracted earlier because it was very difficult to get titanium of high purity required are special applications which is not known in earlier.

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