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Q1. Cyanide process is used in the extraction of
  •  Au
  •  Cu
  •  Ag
  •  Both (a) and (c)
Solution
Cyanide process is used in the extraction of both silver and gold because these form complex salts with CN^- ion due to presence of lone pair of electron on nitrogen atom

Q2.Lapis-Lazuli’ is a blue coloured precious stone. It is mineral of the class
  •  Basic copper carbonate
  •  Sodium alumino silicate
  •  Zinc cobalt
  •  Prussian blue
Solution
Lapis lazuli is the sodium alumino silicate present in earth rocks as blue stone

Q3.  Which of the following statements about the advantages of roasting of sulphide ore before reduction is not true?
  •   〖∆G〗_f^ͦ of the sulphide is greater than CS_2 and H_2 S
  •  ∆G_f^ͦ is negative for roasting of sulphide ore to oxide
  •  Roasting of the sulphide to oxide is thermodynamically feasible
  •  Carbon and hydrogen are suitable reducing agents for metal sulphides
Solution
∆ G_f^ͦ for sulphides > ∆G_f^ͦ of CS_2 and H_2 S and thus,C and H_2 cannot reduce metal sulphide

Q4. In the thermite process the reducing agent is:/span>
  •  C
  •  Mg
  •  Na
  •  Al
Solution
Al acts as strong reducing agent and converts many metal oxides (excepts I and II gp) to metals.

Q5.Which process is used for benefication of ores?
  •  Process of removal of impurities
  •  Process of heating ore at high temperature
  •  Extraction of metal from ore
  •  None of the above
Solution
 Dressing or benefication of ore involves removal of impurities from ore.

Q6. In the electrolysis of alumina, cryolite is added to:
  •  Minimise the anode effect
  •  Lower the melting point of alumina and to increase the electrical conductivity
  • Remove impurities from alumina
  •  None of the above
Solution
Cryolite has these two functions during electrolysis of alumina.

Q7.Wulfenite (a yellow-red mineral) having waxy lustre occur in lead ores, is an important source of:
  •  Sulphur
  •  Lead
  •  Molybdenum
  •  Helium
Solution
Wulfenite is a molybdate containing Pb,Mo,O_4 .

Q8.The process of Zinc –plating on iron sheet is known as
  •  Annealing
  •  Galvanization
  •  smelting
  •  Roasting
Solution
Alloys of metals with Hg are called amalgams.

Q9.An essential constituent of amalgam is:
  •  Au
  •  Ag
  •  Al
  •  Hg
Solution
The process of zinc –plating on iron-sheet is known is known as galvanisation

Q10. An ore of potassium is
  •  Cryolite
  •  Carnallite
  •  Dolomite
  • Bauxite
Solution
B

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BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE: METALLURGY QUIZ-1
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