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

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

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8.
State the role of silica in the metallurgy of copper.

During the roasting of pyrite ore, a mixture of FeO and Cu₂O is obtained.

2 {CuFeS}_{2} + O_{2} \overset{∆}{\to} {Cu}_{2} S + 2 FeS + {SO}_{2} 2 {Cu}_{2} S + 3 O_{2} \overset{∆}{\to} 2 {Cu}_{2} O + 2 {SO}_{2} 2 Fe + 3 O_{2} \overset{∆}{\to} FeO + 2 {SO}_{2}

The role of silica in the metallurgy of copper is to remove the iron oxide obtained during the process of roasting as ‘slag’. FeS obtained from roasting iron sulphide ore is converted into FeO which forms iron silicate with silica (SiO₂). Thus FeO is removed as FeSiO₃(slag).