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d- and f-Block Elements

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

Which of the following acts as a strong reducing agent? (Atomic number: Ce = 58, Eu = 63, Gd = 64, Lu = 71)

  1. Eu2+
  2. Gd3+
  3. Lu3+
  4. Ce4+

Answer

(1) Eu2+

Solution

Common (most stable) oxidation state of lanthanoids = +3.

(1): Eu2+ (4f7) Eu3+ (4f6) + e- ⇒ (1) is a strong reducing agent

(2): Gd3+ (4f7, half-filled) ⇒ (2) is stable, not reducing

(3): Lu3+ ( 4f14, full) ⇒ (3) is stable, not reducing

(4): Ce4+ + e- Ce3+ ⇒ (4) is an oxidising agent

∵ As per NCERT, Eu2+ is a strong reducing agent, changing to the common +3 state.

Answer: (1)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2024, 29 January (Evening Shift)

Which of the following statements are correct about Zn, Cd and Hg? Choose the most appropriate from the options given below:

  1. C, D only
  2. B, C only
  3. A, D only
  4. B, D only
Ques. 3JEE Main 2024, 27 January (Morning Shift)

Which of the following electronic configuration would be associated with the highest magnetic moment?

  1. [Ar]3d7
  2. [Ar]3d8
  3. [Ar]3d3
  4. [Ar]3d6
Ques. 4JEE Main 2024, 27 January (Morning Shift)

The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]

  1. [Xe]4f4 6s2
  2. [Xe]5f4 7s2
  3. [Xe]4f6 6s2
  4. [Xe]4f1 5d1 6s2
Ques. 5JEE Main 2024, 27 January (Evening Shift)

Identify the incorrect pair from the following :

  1. Haber process - Iron
  2. Polythene preparation - TiCl4, Al(CH3)3
  3. Photography - AgBr
  4. Wacker process - PtCl2
Ques. 6JEE Main 2024, 27 January (Evening Shift)

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

  1. Both Statement I and Statement II are false
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are true
  4. Statement I is false but Statement II is true
Ques. 7JEE Main 2024, 27 January (Evening Shift)

Choose the correct option having all the elements with d10 electronic configuration from the following :

  1. 46Pd, 28Ni, 26Fe, 24Cr
  2. 29Cu, 30Zn, 48Cd, 47Ag
  3. 27Co, 28Ni, 26Fe, 24Cr
  4. 28Ni, 24Cr, 26Fe, 29Cu

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