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d- and f-Block Elements

JEE Main 2024 (Online) 6th April Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2024, 6 April (Evening Shift)

Arrange the following elements in the increasing order of number of unpaired electrons in it. Choose the correct answer from the options given below :

  1. (A) < (D) < (C) < (B) < (E)
  2. (A) < (D) < (C) < (E) < (B)
  3. (B) < (C) < (D) < (E) < (A)
  4. (C) < (E) < (B) < (A) < (D)

Answer

(2) (A) < (D) < (C) < (E) < (B)

Solution

(A) Sc: [Ar]3d1 4s2 ⇒ 1 unpaired

(D) Ti: [Ar]3d2 4s2 ⇒ 2

(C) V: [Ar]3d3 4s2 ⇒ 3

(E) Mn: [Ar]3d5 4s2 ⇒ 5

(B) Cr: [Ar]3d5 4s1 ⇒ 6

∵ half-filled 3d5 is extra stable

∴ (A) < (D) < (C) < (E) < (B)

Answer: (2)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2024, 6 April (Evening Shift)

Among VO2+, MnO4- and Cr2O72-, the spin-only magnetic moment value of the species with least oxidising ability is BM (Nearest integer). (Given atomic number V = 23, Mn = 25, Cr = 24)

Ques. 3JEE Main 2024, 5 April (Morning Shift)

The metal that shows highest and maximum number of oxidation state is :

  1. Co
  2. Mn
  3. Fe
  4. Ti
Ques. 4JEE Main 2024, 5 April (Morning Shift)

The spin-only magnetic moment value of the ion among Ti2+, V2+, Co3+ and Cr2+, that acts as strong oxidising agent in aqueous solution is BM (Near integer). (Given atomic numbers : Ti : 22, V : 23, Cr : 24, Co : 27)

Ques. 5JEE Main 2024, 5 April (Evening Shift)

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is . Ti2+, Cr2+ and V2+

  1. 1
  2. 2
  3. 3
  4. 0
Ques. 6JEE Main 2024, 5 April (Evening Shift)

The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of CO2. The sum of spin-only magnetic moment values of A and B is B.M. (Nearest integer) [Given atomic number : C : 6, Na : 11, O : 8, Fe : 26, Cr : 24]

Ques. 7JEE Main 2024, 4 April (Morning Shift)

The element which shows only one oxidation state other than its elemental form is :

  1. Nickel
  2. Titanium
  3. Cobalt
  4. Scandium
Ques. 8JEE Main 2024, 4 April (Morning Shift)

Consider the following reaction MnO2 + KOH + O2 A + H2O. Product 'A' in neutral or acidic medium disproportionate to give products 'B' and 'C' along with water. The sum of spin-only magnetic moment values of B and C is BM. (nearest integer) (Given atomic number of Mn is 25)

Ques. 9JEE Main 2024, 4 April (Evening Shift)

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal is

  1. 22
  2. 23
  3. 26
  4. 25
Ques. 10JEE Main 2024, 4 April (Evening Shift)

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M2On (where n = 3, 4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is BM (near integer) (Given atomic number: Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu : 29, Zn : 30)

Ques. 11JEE Main 2024, 1 February (Morning Shift)

In acidic medium, K2Cr2O7 shows oxidising action as represented in the half reaction: Cr2O72- + XH+ + Ye 2A + ZH2O X, Y, Z and A are respectively :

  1. 14, 7, 6 and Cr3+
  2. 14, 6, 7 and Cr3+
  3. 8, 4, 6 and Cr2O3
  4. 8, 6, 4 and Cr2O3

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