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d- and f-Block Elements · Question 25

NEET (UG) 2020MCQEasy📈 Topic in 25% papers+4−1
1

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.

Answer

(3) The oxidation states of chromium in CrO42- and Cr2O72- are not the same.

Solution

In CrO42-: x + 4(-2) = -2 ⇒ x = +6

In Cr2O72-: 2x + 7(-2) = -2 ⇒ x = +6

⇒ The oxidation state of chromium is the same (+6) in both ⇒ statement (C) is incorrect.

Statements (A) and (B) are as given in NCERT.

(D) Cr2+ Cr3+ gives the stable d3 ( t2g3) configuration (E Cr3+/Cr2+ = -0.41 V), whereas E Fe3+/Fe2+ = +0.77 V ⇒ Cr2+ is the stronger reducing agent ⇒ correct.

Answer: (3)

NEET (UG) 2020

Keep practising — d- and f-Block Elements

2

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
3

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

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

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
5

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)
6

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)
7

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)
8

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
9

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)
10

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)
11

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

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