TRANSITION ELEMENT QUIZ-1

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.