PYQSide ExamsMy practice

d- and f-Block Elements · Question 23

NEET (UG) 2021MCQEasy📈 Topic in 25% papers+4−1
1

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

  1. Having similar chemical properties
  2. Belonging to same group
  3. Diagonal relationship
  4. Lanthanoid contraction

Answer

(4) Lanthanoid contraction

Solution

As per NCERT, Hf (5d series) comes after the 14 lanthanoids, in which the 4f orbitals are filled.

∵ 4f electrons shield the nuclear charge very poorly ⇒ the size decreases steadily across the lanthanoids (lanthanoid contraction).

This decrease almost exactly cancels the expected increase in size from the 4d to the 5d series.

∴ Zr (160 pm) and Hf (159 pm) have almost identical radii.

Answer: (4)

NEET (UG) 2021

Keep practising — d- and f-Block Elements

2

The calculated spin only magnetic moment of Cr2+ ion is?

  1. 4.90 BM
  2. 5.92 BM
  3. 2.84 BM
  4. 3.87 BM
NEET (UG) 2020
3

Identify the incorrect statement.

  1. The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
  2. Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
  3. The oxidation states of chromium in CrO42- and Cr2O72- are not the same.
  4. Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
NEET (UG) 2020
4

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
NEET (UG) 2019
5

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

  1. CrO42-
  2. Cr2O72-
  3. MnO4-
  4. MnO42-
NEET 2018
6

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.
NEET 2017
7

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.
NEET 2016 (Phase 1)
8

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
NEET 2016 (Phase 1)
9

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)
10

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
11

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)

All d- and f-Block Elements PYQs →

PDFDownload d- and f-Block Elements PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry