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d- and f-Block Elements

JEE Main 2026 (Online) 28th January Morning ShiftMCQMedium📈 Topic in 34% papers+4−1
Ques. 1JEE Main 2026, 28 January (Morning 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. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false

Answer

(2) Both Statement I and Statement II are false

Solution

Statement I: a transition metal ion is coloured when it has partly filled d orbitals (d1 to d9), allowing d–d transitions.

Sc3+ (3d0) colourless, Ti3+ (3d1) coloured pair not counted

Mn2+ (3d5) coloured, Cr2+ (3d4) coloured pair counted

Cu2+ (3d9) coloured, Zn2+ ( 3d10) colourless pair not counted

Ni2+ (3d8) coloured, Ti4+ (3d0) colourless pair not counted

Only 1 pair has both ions coloured, not 3. Statement I is false.

Statement II: Th4+ (5f0, noble gas core), Ce4+ (4f0) and Gd3+ (4f7) are stable states with no tendency to lose electrons; Ce4+ is in fact a strong oxidant.

Eu2+ (4f7) readily changes to the common +3 state ( Eu2+ Eu3+ + e-), so as per NCERT it is a strong reducing agent.

Eu2+, not Th4+, is the strongest reducing agent. Statement II is false.

Answer: (2)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2026, 28 January (Evening Shift)

Consider the following statements about manganate and permanganate ions. Identify the correct statements. Choose the correct answer from the options given below :

  1. A and D Only
  2. A, B and C Only
  3. A, C and D Only
  4. A, D and E Only
Ques. 3JEE Main 2026, 24 January (Evening Shift)

"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in "X". The color of the potassium salt of X is

  1. purple
  2. orange
  3. yellow
  4. green
Ques. 4JEE Main 2026, 23 January (Evening Shift)

The oxidation state of chromium in the final product formed in the reaction between KI and acidified K2Cr2O7 solution is :

  1. +2
  2. +3
  3. +4
  4. +6
Ques. 5JEE Main 2026, 22 January (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 true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
Ques. 6JEE Main 2026, 22 January (Evening Shift)

Among the following oxides of 3d elements, the number of mixed oxides are . Ti2O3, V2O4, Cr2O3, Mn3O4, Fe3O4, Fe2O3, Co3O4

Ques. 7JEE Main 2026, 21 January (Morning Shift)

MnO42-, in acidic medium, disproportionates to :

  1. MnO4- and MnO
  2. MnO4- and MnO2
  3. Mn2O7 and MnO2
  4. Mn2O7 and MnO
Ques. 8JEE Main 2026, 21 January (Morning Shift)

Consider the following reactions : NaCl + K2Cr2O7 + H2SO4 A + KHSO4 + NaHSO4 + H2O A + NaOH B + NaCl + H2O B + H2SO4 + H2O2 C + Na2SO4 + H2O In the product 'C', 'X' is the number of O22- units, 'Y' is the total number of oxygen atoms present and 'Z' is the oxidation state of Cr. The value of X + Y + Z is .

Ques. 9JEE Main 2026, 21 January (Evening Shift)

Given below are some of the statements about Mn and Mn2O7. Identify the correct statements. Choose the correct answer from the options given below :

  1. A, B, C and D
  2. A, B and D Only
  3. A, B and C Only
  4. A, C and D Only
Ques. 10JEE Main 2025, 8 April (Evening Shift)

The correct decreasing order of spin only magnetic moment values (BM) of Cu+, Cu2+, Cr2+ and Cr3+ ions is :

  1. Cr3+ > Cr2+ > Cu+ > Cu2+
  2. Cu+ > Cu2+ > Cr3+ > Cr2+
  3. Cr2+ > Cr3+ > Cu2+ > Cu+
  4. Cu2+ > Cu+ > Cr2+ > Cr3+
Ques. 11JEE Main 2025, 7 April (Morning Shift)

The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ions ( Mn+) exists in green colour. The nature of the oxide formed by the above Mn+ ion is:

  1. basic
  2. neutral
  3. amphoteric
  4. acidic

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