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Practice each question, then open the answer or worked solution.
At the temperature corresponding to which of the points in Fig.6.1, FeO will
be reduced to Fe by coupling the reaction 2FeO → 2Fe + O2
with all of the
following reactions?
(a) C + O2 → CO2
(b) 2C + O2 → 2CO and (c) 2CO + O2 → 2 CO2
(i) Point A
(ii) Point B
(iii) Point D
(iv) Point ESolution:
Option (ii) and (iv) are the answers.
Solution coming soon.
Which of the following option are correct?
(i) Cast iron is obtained by remelting pig iron with scrap iron and coke
using hot air blast.
(ii) In the extraction of silver, silver is extracted as cationic complex.
(iii) Nickel is purified by zone refining.
(iv) Zr and Ti are purified by van Arkel method
Option (i) and (iv) are the answers.
In the extraction of aluminium by Hall-Heroult process, purified Al2O3
is mixed with CaF2 to
(i) lower the melting point of Al2O3
(ii) increase the conductivity of molten mixture.
(iii) reduce Al3+ into Al(s).
(iv) acts as a catalyst
Option (i) and (ii) are the answers.
Which of the following statements is correct about the role of substances added
in the froth floatation process?
(i) Collectors enhance the non-wettability of the mineral particles.
(ii) Collectors enhance the wettability of gangue particles.
(iii) By using depressants in the process two sulphide ores can be separated.
(iv) Froth stabilisers decrease wettability of gangue.
Option (i) and (iii) are the answers.
In the Froth Floatation process, zinc sulphide and lead sulphide can be
separated by ______________.
(i) using collectors.
(ii) adjusting the proportion of oil to water.
(iii) using depressant.
(iv) using froth stabilisers.
Option (ii) and (iii) are the answers.
Common impurities present in bauxite are ____________.
(i) CuO
(ii) ZnO
(iii) Fe2O3
(iv) SiO2
Option (iii) and (iv) are the answers.
Which of the following ores are concentrated by froth flotation?
(i) Haematite
(ii) Galena
(iii) Copper pyrites
(iv) MagnetiteSolution:
Option (ii) and (iii) are the answers.
Solution coming soon.
Which of the following reactions occur during calcination?
(i) CaCO3 → CaO + CO2
(ii) 2FeS2 + 11/2 O2 → Fe2O3 + 4SO2
(iii) Al2O3.x H2O → Al2O3 + x H2O
(iv) ZnS + 3/2O2 → ZnO + SO2
Option (i) and (iii) are the answers.
For the metallurgical process of which of the ores calcined ore can be reduced
by carbon?
(i) haematite
(ii) calamine
(iii) iron pyrites
(iv) sphalerite
Option (i) and (ii) are the answers.
The main reactions occurring in the blast furnace during the extraction of iron from
haematite are ________.
(i) Fe2O3 + 3CO → 2Fe + 3CO2
(ii) FeO + SiO2 → FeSiO3
(iii) Fe2O3 + 3C → 2Fe + 3CO
(iv) CaO + SiO2 → CaSiO3
Option (i) and (iv) are the answers