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d- and f-Block Elements · Question 73

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

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+

Answer

(2) Y3+ < Lu3+ < Eu3+ < La3+

Solution

Y (Z = 39) is a 4d element lying in period 5, just above La in group 3.

⇒ Y3+ has one shell less than La3+, Eu3+ and Lu3+ (period 6) ⇒ Y3+ is the smallest of the four.

As per NCERT, in the lanthanoid series the M3+ ionic radii decrease steadily from La3+ to Lu3+ (lanthanoid contraction, due to poor shielding by 4f electrons).

⇒ La3+ > Eu3+ > Lu3+

∴ Y3+ < Lu3+ < Eu3+ < La3+

Answer: (2)

AIPMT 2003

Keep practising — d- and f-Block Elements

2

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
3

Which of the following shows maximum number of oxidation states?

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

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
5

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
AIPMT 2000
6

Which ion is colourless?

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

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