What happens in the extraction of chlorine by electrolysis of brine?

1. Oxidation of Cl- ion to chlorine gas occurs.

2. Reduction of Cl- ion to chlorine gas occurs.

3. For overall reaction G° has negative value.

4. A displacement reaction takes place.

Subtopic:  Metallurgy of individual elements |
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What does copper matte contain?

1. Sulphides of copper(I), and iron(II)

2. Sulphides of copper (II), and iron(III)

3. Sulphides of copper(II), and iron(II)

4. Sulphides of copper(I), and iron(III)

Subtopic:  Metallurgy of individual elements |
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Which of the following reactions is an example of autoreduction?

1. Fe3O4+ 4CO 3Fe+ 4CO2

2.  Cu2O+ C2Cu+ CO

3.  Cu2+aq + Fes Cus +Fe2+aq

4. Cu2O+12Cu2S3Cu+12SO2

Subtopic:  Metallurgy of individual elements |
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Which are the most abundant elements present inside the earth's crust?

1. Al, and Fe 

2. Al, and Cu

3. Fe, and Cu

4. Cu, and Ag

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Zone refining is based on the principle that ..........

1.  Impurities of low boiling metals can be separated by distillation.

2.  Impurities are more soluble in molten metal than in solid metal.

3.  Different components of a mixture are differently adsorbed on an adsorbent.

4.  Vapours of volatile compound can be decomposed in pure metal.

Subtopic:  Refining Process |
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In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2S with :
1. FeS   
2. CO
3. Cu2O   
4. SO2

Subtopic:  Metallurgy of individual elements |
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Brine is electrolysed by using inert electrodes. The reaction at the anode is:

1. Cl-(aq) → \(\frac{1}{2}\)Cl2(g) + e-\(E_{cell}^{o}\) = 1.36 V

2. 2H2O(l) → O2(g) + 4H+ +  4 e-;  \(E_{cell}^{o}\) = 1.23 V

3. Na+(aq) + e- → Na(s); \(E_{cell}^{o}\) = 2.71 V

4. H+(aq) + e-\(\frac{1}{2}\)H2(g); \(E_{cell}^{o}\) = 0.00 V

Subtopic:  Metallurgy of individual elements |
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In the metallurgy of aluminium:

1. Al3+ is oxidised to Al(s).
2. The graphite anode is oxidised to carbon monoxide and carbon dioxide.
3. Oxidation state of oxygen change in the reaction at the anode.
4. The oxidation state of oxygen changes in the overall reaction involved in the process.

Subtopic:  Metallurgy of individual elements |
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Which of the following metals can be purified by electrolytic refining?

1. Cu, and Zn     

2. Ge, and Si     

3. Zr, and Ti     

4. Zn, and Hg

Subtopic:  Metallurgy of individual elements |
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Extraction of gold and silver involves leaching the metal with CN- ion. The metal is recovered by ......

1.  Displacement of metal by some other metal from the complex ion.

2.  Roasting of metal complex.

3.  Calcination followed byroasting.

4.  Thermal decomposition of metal complex.

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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