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d- and f-Block Elements

JEE Main 2024 (Online) 9th April Evening ShiftMCQEasy📈 Topic in 2% papers+4−1
Ques. 1JEE Main 2024, 9 April (Evening Shift)

The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium = 99)

  1. [Rn]5f136d07s2
  2. [Rn]5f126d07s2
  3. [Rn]5f116d07s2
  4. [Rn]5f106d07s2

Answer

(3) [Rn]5f116d07s2

Solution

Rn core has 86 electrons, so Es (Z = 99) has 99 − 86 = 13 electrons beyond [Rn].

Two go into 7s and the remaining 11 into 5f (6d stays empty, as in most later actinoids):

Es: [Rn]5f116d07s2

Answer: (3)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2024, 9 April (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is false but Statement II is true
Ques. 3JEE Main 2024, 9 April (Evening Shift)

A transition metal 'M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin-only magnetic moment value of M+ ion is BM (Nearest integer) (Given atomic number Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)

Ques. 4JEE Main 2024, 8 April (Morning Shift)

Iron (III) catalyses the reaction between iodide and persulphate ions, in which Choose the most appropriate answer from the options given below:

  1. B and C only
  2. A only
  3. A and D only
  4. B only
Ques. 5JEE Main 2024, 8 April (Morning Shift)

The 'spin only' magnetic moment value of MO42- is BM. (Where M is a metal having least metallic radii. among Sc, Ti, V, Cr, Mn and Zn). (Given atomic number: Sc = 21, Ti = 22, V = 23, Cr = 24, Mn = 25 and Zn = 30)

Ques. 6JEE Main 2024, 8 April (Evening Shift)

The equilibrium Cr2O72- 2CrO42- is shifted to the right in :

  1. a weakly acidic medium
  2. a basic medium
  3. a neutral medium
  4. an acidic medium
Ques. 7JEE Main 2024, 8 April (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are false
  4. Both Statement I and Statement II are true
Ques. 8JEE Main 2024, 6 April (Morning Shift)

The number of elements from the following that do not belong to lanthanoids is Eu, Cm, Er, Tb, Yb and Lu

  1. 3
  2. 1
  3. 4
  4. 5
Ques. 9JEE Main 2024, 6 April (Morning Shift)

The difference in the 'spin-only' magnetic moment values of KMnO4 and the manganese product formed during titration of KMnO4 against oxalic acid in acidic medium is BM. (nearest integer)

Ques. 10JEE Main 2024, 6 April (Morning Shift)

Among CrO, Cr2O3 and CrO3, the sum of spin-only magnetic moment values of basic and amphoteric oxides is 10-2 BM (nearest integer). (Given atomic number of Cr is 24 )

Ques. 11JEE 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)

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