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Q1. The element present in gun metal is
  •  Co
  •  Ti
  •  Sc
  •  Cu
Solution
Gun metal is an alloy of Cu, Sn and Zn. It is used to make cartridge of rifles and pistols.

Q2.How is limestone used in Fe extraction?
  •  Oxidation of Fe ore
  •  Formation of slag
  •  Purification of Fe formed
  •  Reduction of Fe ore
Solution
In Fe extraction limestone is used for the formation of slag. The central zone where the temperature varies from 800-1000°C; the lime-stone present in the charge decomposes into calcium oxide and carbon dioxide. CaO_3 □(→┴(1000°C) ) CaO+CO_2 The calcium oxide acts as flux and combines with silica present as an impurity to form a fusible slag of CaSiO_3. CaO+SiO_2⟶CaSiO_3

Q3.  In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up as :
  •   Calcium carbonate
  •  Metallic calcium
  •  Gangue
  •  Slag
Solution


Q4. All metal chlorides are soluble in water except those of:
  •  Ba, Sr, Li
  •  Zn, Cu, Cd
  •  Na, K, Ca
  •  Ag, Pb, Hg
Solution
Chlorides of Ag, Pb and Hg are insoluble in water.

Q5.Which of the following may be colourless?
  •  Cu^+
  •  Cu^(2+)
  •  Cr^(3+)
  •  Fe^(3+)
Solution
 


Q6. Various methods have been employed for protecting iron from rusting. Which of the following is incorrect?
  •  Zinc plating is more permanent than chrome plating
  •  Zinc protects iron but gets corroded itself
  • Tin plating is cheap but unreliable
  •  None of the above
Solution
Zn does not show corrosion

Q7.Percentage of gold in 21.6 carat gold is:
  •  70
  •  10
  •  90
  •  21.6
Solution
24 carat gold means 100% Au

Q8.On the extraction of iron, the slag produced is
  •  MgSiO_3
  •  CaSiO_3
  •  FeSiO_3
  •  CO
Solution



Q9.Which metal is used for filament of electric bulb?
  •  Fe
  •  Cu
  •  Pt
  •  W
Solution
Tungsten filaments are used in bulbs.

Q10. Cl_2+HgO⟶?
  •  Cl_2 O+HgCl
  •  Cl_2 O+HgCl_2
  •  ClO+HgCl
  • ClO+HgCl_2
Solution


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