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Q1. From sodium agrentocyanide Na[Ag(CN)_2], silver is precipitated by adding a powder of:
  •  Tin
  •  Calcium
  •  Mercury
  •  Zinc
Solution



Q2.One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is
  •  Cobalt
  •  Nickel
  •  Tungsten
  •  Iron
Solution

Q3.  Philosopher’s wool on heating with BaO at 1100° C produce
  •   Ba+ZnCl_2
  •  BaCdO_2
  •  BaO_2+Zn
  •  BaZnO_2
Solution


Q4. Blue colour/precipitate will be obtained when K_4 [Fe(CN)_6] reacts with:
  •  Fe(II) ions
  •  Cu(II) ions
  •  Cu(I) ions
  •  Fe(III) ions
Solution

Q5.Which of the following statements concerning transition elements is false?
  •  They show multiple oxidation states always differing by units of two.
  •  Compounds containing their ions are mostly coloured
  •  They easily form complex coordination compounds
  •  They are all metals.
Solution
 Transition element exhibit variable oxidation states because their d-electrons also take part in bonding along with s-electrons. However, the difference between two oxidation states is not always two.

Q6. The composition of malachite is
  •  Cu(OH)_2
  •  CuCO_3.Cu(OH)_2
  • CuCO_3
  •  CuFeS_2
Solution

Q7.The metal that does not displace hydrogen from an acid is:
  •  Ca
  •  Al
  •  Hg
  •  Zn
Solution

Q8.Formation of coloured solution is possible when metal ion in the compound contains
  •  Paired electrons
  •  Unpaired electrons
  •  Lone pair of electrons
  •  None of these
Solution

Q9.Which of the following elements does not belong to the first transition series?
  •  Cu
  •  V
  •  Fe
  •  Ag
Solution
Ag belongs to second (4d) transition series. Remaining all are in first transition series

Q10. Transition metals and their oxides are used in industrial processes as:
  •  Detergents
  •  Catalysis
  •  Insecticides
  • None of these
Solution
Section Transition metals and their compounds are very good catalysts, e.g., CuCl_2 in Deacon’s process, Ni in hydrogenation of oils.

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