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d- and f-Block Elements

NEET (UG) 2019MCQMedium📈 Topic in 38% papers+4−1
Ques. 1NEET (UG) 2019

The manganate and permanganate ions are tetrahedral due to :

  1. The -bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese
  2. The -bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese
  3. The -bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
  4. There is no -bonding

Answer

(3) The -bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

Solution

As per NCERT, the manganate ( MnO42-) and permanganate (MnO4-) ions are tetrahedral; the π-bonding takes place by overlap of p-orbitals of oxygen with d-orbitals of manganese (dπ–pπ bonding).

Oxygen has no d-orbitals in its valence shell ⇒ option (2) is not possible; p–p overlap is not involved ⇒ option (1) is wrong; π-bonds are present ⇒ option (4) is wrong.

Answer: (3)

Keep practising — d- and f-Block Elements

Ques. 2NEET 2018

Which one of the following ions exhibits d-d transition and paramagnetism as well?

  1. CrO42-
  2. Cr2O72-
  3. MnO4-
  4. MnO42-
Ques. 3NEET 2017

The reason for greater range of oxidation states in actinoids is attributed to

  1. actinoid contraction
  2. 5f, 6d and 7s levels having comparable energies
  3. 4f and 5d levels being close in energies
  4. the radioactive nature of actinoids.
Ques. 4NEET 2016 (Phase 1)

Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?

  1. SO2 is reduced.
  2. Green Cr2(SO4)3 is formed.
  3. The solution turns blue.
  4. The solution is decolourised.
Ques. 5NEET 2016 (Phase 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
Ques. 6NEET 2016 (Phase 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.
Ques. 7AIPMT 2015

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
Ques. 8AIPMT 2015 (Cancelled)

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+
Ques. 9AIPMT 2015 (Cancelled)

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)
Ques. 10AIPMT 2014

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
Ques. 11AIPMT 2014

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+

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