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 |
 82%
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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 |
 76%
From NCERT
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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 |
 60%
From NCERT
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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 |
 74%
From NCERT
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The temperature at which carbon reduce FeO to Fe and produce CO is:

1. Lower than  400 oC

2. 400 oC

3. Higher than 600 oC

4. Higher than 400 oC

Subtopic:  Ellingham Diagram |
From NCERT
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The correct statement among the following regarding the reaction of FeO below point A in the above diagram is:

 
1. Reduced by carbon monoxide only.

2. Reduced by both carbon monoxide and carbon.

3. Reduced by carbon only.

4. Not  reduced by both carbon and carbon monoxide.

Subtopic:  Ellingham Diagram |
 54%
From NCERT
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The correct statement for the reduction of FeO at the temperature corresponding to point D is: 
 

  

1. ∆G value for the overall reduction reaction with carbon monoxide is zero.
2. ∆G value for the overall reduction reaction with a mixture of 1 mol carbon, and 1 mol oxygen is positive.
3. ∆G value for the overall reduction reaction with a mixture of 2 mol of carbon, and 1 mol of oxygen will be positive.
4. ∆G value for the overall reduction reaction with carbon monoxide is negative.

Subtopic:  Ellingham Diagram |
From NCERT
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Which of the following statement is correct?  

1. Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
2. In the extraction of silver, silver is extracted as a cationic complex.
3. Nickel is purified by zone refining.
4. Zr, and Ti are purified by the van Arkel method.


1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Subtopic:  Refining Process |
 84%
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In the extraction of aluminium by the Hall-Heroult process, purified Al2O3 is mixed with CaF2 to:

a. Lower the melting point of Al2O3
b. Increase the conductivity of the molten mixture.
c. Reduce Al3+into Als
d. Act as a catalyst

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

Subtopic:  Metallurgy of individual elements |
 78%
From NCERT
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From the following, the correct statements about the role of substances added in the froth flotation process are:

a. Collectors enhance the non-wettability of the mineral particles.
b. Collectors enhance the wettability of gangue particles.
c. By using depressants in the process, two sulphide ores can be separated.
d. Froth stabilisers decrease the wettability of gangue.


1. a and b
2. b and c
3. c and d
4. a and c

Subtopic:  Refining Process |
 62%
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