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d- and f-Block Elements · Question 30

NEET 2016 (Phase 1)MCQMedium📈 Topic in 25% papers+4−1
1

The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

  1. [Xe]4f6 5d1 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f8 5d1 6s2
  2. [Xe]4f7 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2
  3. [Xe]4f7 6s2, [Xe]4f8 6s2 and [Xe]4f8 5d1 6s2
  4. [Xe]4f6 5d1 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2

Answer

(2) [Xe]4f7 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2

Solution

As per NCERT (table of lanthanoid configurations):

Eu (63): [Xe]4f7 6s2 (half-filled 4f, extra stability)

Gd (64): [Xe]4f7 5d1 6s2 (keeps the stable 4f7; the next electron enters 5d)

Tb (65): [Xe]4f9 6s2

Answer: (2)

NEET 2016 (Phase 1)

Keep practising — d- and f-Block Elements

2

Which one of the following statements related to lanthanoids is incorrect?

  1. Europium shows +2 oxidation state.
  2. The basicity decreases as the ionic radius decreases from Pr to Lu.
  3. All the lanthanons are much more reactive than aluminium.
  4. Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis.
NEET 2016 (Phase 2)
3

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

  1. [Xe]4f9 5s1
  2. [Xe]4f7 5d1 6s2
  3. [Xe]4f6 5d2 6s2
  4. [Xe]4f8 6d2
AIPMT 2015
4

Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)

  1. Cr2+
  2. Co2+
  3. Ni2+
  4. Ti3+
AIPMT 2015 (Cancelled)
5

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

  1. Zr(40) and Hf(72)
  2. Zr(40) and Ta(73)
  3. Ti(22) and Zr(40)
  4. Zr(40) and Nb(41)
AIPMT 2015 (Cancelled)
6

The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives

  1. Mn4+ and O2
  2. Mn2+ and O2
  3. Mn2+ and O3
  4. Mn4+ and MnO2
AIPMT 2014
7

Magnetic moment 2.83 BM is given by which of the following ions? (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

  1. Ti3+
  2. Ni2+
  3. Cr3+
  4. Mn2+
AIPMT 2014
8

Reason of lanthanoid contraction is

  1. negligible screening effect of 'f'-orbitals
  2. increasing nuclear charge
  3. decreasing nuclear charge
  4. decreasing screening effect.
AIPMT 2014
9

KMnO4 can be prepared from K2MnO4 as per the reaction, 3MnO42- + 2H2O 2MnO4- + MnO2 + 4OH- The reaction can go to completion by removing OH- ions by adding

  1. CO2
  2. SO2
  3. HCl
  4. KOH
NEET 2013
10

Which of the following does not give oxygen on heating?

  1. K2Cr2O7
  2. (NH4)2Cr2O7
  3. KClO3
  4. Zn(ClO3)2
NEET 2013
11

Which of the following statements about the interstitial compounds is incorrect?

  1. They are much harder than the pure metal.
  2. They have higher melting points than the pure metal.
  3. They retain metallic conductivity.
  4. They are chemically reactive.
NEET 2013

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