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Q1. Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
  •  In the presence of NaCl
  •  In the presence of fluorite
  •  In the presence of cryolite which forms a melt with high melting point
  •  In the presence of cryolite which forms a melt with lower melting point
Solution
In the extraction of Al,Al_2 O_3 is melted with cryolite[Na_3 (AlF_6)]. Cryolite improves the electrical conductivity of the alumina and lowers the m.p. of the mixture to about 950℃

Q2.Which one of the following is correct?
  •  All minerals are ores
  •  All ores are minerals
  •  A mineral cannot be an ore
  •  All ores cannot be a mineral
Solution
All minerals are not suitable for the extraction for the extraction of metals commercially. Thus, all ores are minerals, but all minerals are not ores

Q3.  Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by leaching?
  •   Galena
  •  Copper pyrite
  •  Sphalerite
  •  Argentite
Solution
Ag,Au are obtained by complex formation

Q4. Alloys of which metal are light and strong and are used in the manufacture of aeroplanes?
  •  Cr
  •  Sn
  •  Fe
  •  Mg
Solution
Mg alloys are lighter.

Q5.One of the fertilizer is:
  •  CaCN_2
  •  CaSO_4
  •  CaCO_3
  •  CaC_2
Solution
 CaCN_2 is used as a fertilizer.

Q6. Which is used for the extraction of cadmium from cadmium sulphide?
  •  Roasting
  •  Reduction
  • Oxidation
  •  Electrolysis
Solution
d is found as traces in most Zn ores, and is extracted from these. Zn_((solid))+Cd_((solution))^(2+)→Zn_((solution))^(2+)+Cd_((solid));E=0.36 V

Q7.Heating of carbonate ores to remove carbon is called as:
  •  Roasting
  •  Fluxing
  •  Calcination
  •  Smelting
Solution
Calcination is a process in which the ore is heated strongly in the absence of air. (i) It removes the volatile impurities like CO_2,SO_2, organic matter, moisture from the ore. (ii)It removes water from the hydrated ore. (iii)It removes carbon as CO_2 from a carbonate ore. CaCO_3 □(→┴∆ ) CaO+CO_2 Lime stone

Q8.Which of the following is the heaviest metal?
  •  Hg
  •  U
  •  Ra
  •  Pb
Solution
Mass number of uranium is highest, i.e., U^238.

Q9.Froth floatation process for the concentration of ores is a practical application of:
  •  Sedimentation
  •  Coagulation
  •  Absorption
  •  Adsorption
Solution
Gangue particles are wetted up by water and adsorbed.

Q10. Blast furnace is used in the metallurgy of:
  •  Gold
  •  Fe
  •  Ag
  • Al
Solution
It is a fact

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METALLURGY QUIZ-7
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