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d- and f-Block Elements · Question 71

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

  1. High enthalpy of atomization
  2. Paramagnetic behaviour
  3. Colour of hydrated ions
  4. Variable oxidation states

Answer

(4) Variable oxidation states

Solution

As per NCERT, the catalytic activity of transition metals is attributed to their ability to adopt multiple oxidation states and to form complexes.

⇒ e.g. Fe3+ catalyses the reaction between iodide and persulphate ions by changing between Fe3+ and Fe2+:

2Fe3+ + 2I- 2Fe2+ + I2

2Fe2+ + S2O82- 2Fe3+ + 2SO42-

∴ Catalytic activity is associated with variable oxidation states.

Answer: (4)

AIPMT 2003

Keep practising — d- and f-Block Elements

2

The basic character of the transition metal monoxides follows the order (Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)

  1. VO > CrO > TiO > FeO
  2. CrO > VO > FeO > TiO
  3. TiO > FeO > VO > CrO
  4. TiO > VO > CrO > FeO
AIPMT 2003
3

The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is (Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

  1. Y3+ < La3+ < Eu3+ < Lu3+
  2. Y3+ < Lu3+ < Eu3+ < La3+
  3. Lu3+ < Eu3+ < La3+ < Y3+
  4. La3+ < Eu3+ < Lu3+ < Y3+
AIPMT 2003
4

General electronic configuration of lanthanides is

  1. (n-2)f1-14 (n-1)s2p6d0-1 ns2
  2. (n-2)f0-14 (n-1)d0-1 ns2
  3. (n-2)f0-14 (n-1)d10 ns2
  4. (n-2)d0-1 (n-1)f1-14 ns2
AIPMT 2002
5

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
AIPMT 2002
6

Which of the following statements is not correct?

  1. La(OH)3 is less basic than Lu(OH)3.
  2. In lanthanide series ionic radius of Ln3+ ion decreases.
  3. La is actually an element of transition series rather than lanthanides.
  4. Atomic radii of Zr and Hf are nearly the same because of lanthanide contraction.
AIPMT 2001
7

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
AIPMT 2000
8

Which ion is colourless?

  1. Cr4+
  2. Sc3+
  3. Ti3+
  4. V3+
AIPMT 2000

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