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d- and f-Block Elements

JEE Main 2025 (Online) 23rd January Morning ShiftMCQMedium📈 Topic in 32% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

The correct set of ions (aqueous solution) with same colour from the following is:

  1. V2+, Cr3+, Mn3+
  2. Ti4+, V4+, Mn2+
  3. Sc3+, Ti3+, Cr2+
  4. Zn2+, V3+, Fe3+

Answer

(1) V2+, Cr3+, Mn3+

Solution

Concept: colour comes from d–d transitions; d0 and d10 ions are colourless.

(1) V2+ (d3), Cr3+ (d3), Mn3+ (d4): all violet ✓

(2) colourless, blue, pink; (3) colourless, purple, blue; (4) colourless, green, yellow ⇒ all different

Answer: (1)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2025, 23 January (Evening Shift)

Match List - I with List - II Choose the correct answer from the options given below :

  1. A-IV, B-II, C-III, D-I
  2. A-IV, B-III, C-I, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-III, B-IV, C-II, D-I
Ques. 3JEE Main 2025, 23 January (Evening Shift)

Consider the following reactions K2Cr2O7 [-H2O]KOH [A] [-H2O]H2SO4 [B] + K2SO4 The products [A] and [B], respectively are :

  1. K2Cr(OH)6 and Cr2O3
  2. K2CrO4 and Cr2O3
  3. K2CrO4 and K2Cr2O7
  4. K2CrO4 and CrO
Ques. 4JEE Main 2025, 22 January (Morning Shift)

Lanthanoid ions with 4f7 configuration are : Choose the correct answer from the options given below :

  1. B and E only
  2. B and C only
  3. A and D only
  4. A and B only

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