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d- and f-Block Elements · Question 69

AIPMT 2004MCQEasy📈 Topic in 0% papers+4−1
1

Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is [At. Nos. Ti = 22, V = 23, Cr = 24, Mn = 25]

  1. Ti3+, V2+, Cr3+, Mn4+
  2. Ti+, V4+, Cr6+, Mn7+
  3. Ti4+, V3+, Cr2+, Mn3+
  4. Ti2+, V3+, Cr4+, Mn5+

Answer

(4) Ti2+, V3+, Cr4+, Mn5+

Solution

When a 3d-series atom forms an ion, the 4s electrons are lost first.

Number of 3d electrons in Mn+ = Z - 18 - n

Ti2+: 22 - 18 - 2 = 2; V3+: 23 - 18 - 3 = 2

Cr4+: 24 - 18 - 4 = 2; Mn5+: 25 - 18 - 5 = 2

All ions of series (4) are 3d2 (in (1), Ti3+ is 3d1; in (2), Ti+ is 3d24s1 and V4+ is 3d1; in (3), Ti4+ is 3d0).

Answer: (4)

AIPMT 2004

Keep practising — d- and f-Block Elements

2

Lanthanoids are

  1. 14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
  2. 14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel
  3. 14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel
  4. 14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.
AIPMT 2004
3

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
AIPMT 2003
4

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
5

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
6

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
7

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
AIPMT 2002
8

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
9

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
AIPMT 2000
10

Which ion is colourless?

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

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