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d- and f-Block Elements

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

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)

Keep practising — d- and f-Block Elements

Ques. 2AIPMT 2003

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
Ques. 3AIPMT 2003

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+
Ques. 4AIPMT 2002

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
Ques. 5AIPMT 2002

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
Ques. 6AIPMT 2001

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.
Ques. 7AIPMT 2000

Which of the following shows maximum number of oxidation states?

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

Which ion is colourless?

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

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