The d and f Block Elements NEET PYQs (1988–2026)

Solved The d and f Block Elements PYQs

3 recent questions with answers. The full set of 115 is free to practise.

1. NEET 2026MediumOxidation States
   Q1

   The green paramagnetic species formed by heating KMnO₄ at 513 K is:

   • AK₂MnO₄
   • BMn₃O₄
   • CMnO
   • DKO₂

   Show answer & solution

   Correct answer: (A)

   2KMnO₄ → K₂MnO₄ + MnO₂ + O₂. K₂MnO₄ is green and paramagnetic (Mn in +6 oxidation state, d¹).
2. NEET 2026HardMagnetic Properties
   Q2

   The lanthanide ion having four unpaired electrons is (Given: Atomic numbers of Ce = 58, Nd = 60, Tb = 65 and Ho = 67):

   • ANd³⁺
   • BCe³⁺
   • CTb³⁺
   • DHo³⁺

   Show answer & solution

   Correct answer: (D)

   Ce³⁺: [Xe]4f¹ (1 unpaired)
   
   Nd³⁺: [Xe]4f³ (3 unpaired)
   
   Tb³⁺: [Xe]4f⁸ (8 unpaired? Actually 4f⁸ has 8 electrons, unpaired = 8?
   
   No, for 4f, maximum unpaired is 7 in half-filled. So 4f⁸ has 6 unpaired?
   
   Let me calculate: For f orbital, maximum 14 electrons, half-filled 7.
   
   4f⁸ has 6 unpaired (since 8 > 7, so 7 paired? Actually 4f⁸: 6 unpaired?
   
   No, 4f⁸ has 6 unpaired and 2 paired. So 6 unpaired.)
   
   Ho³⁺: [Xe]4f¹⁰ (10 electrons, 4 unpaired? Since 14-10=4, so 4
   
   unpaired.)
   
   So Ho³⁺ has 4 unpaired electrons.
3. NEET 2026HardProperties of D-Block Elements
   Q3

   Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
   
   Assertion A: Generally, 3d transition metals have high melting points.
   
   Reason R: Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding.
   
   In light of the above statements, choose the most appropriate answer from the options given below:

   • ABoth A and R are correct and R is the correct
     
     explanation of A
   • BBoth A and R are correct and R is NOT the correct
     
     explanation of A
   • CA is correct but R is not correct
   • DA is not correct but R is correct

   Show answer & solution

   Correct answer: (A)

   3d transition metals have high melting points due to involvement of both3d and 4s electrons in metallic bonding. So A and R are correct and R is the correct explanation.

Topic-wise question count

Where NEET has asked from The d and f Block Elements, most frequent first.

• Properties of D-Block Elements43
• Magnetic Properties19
• Applications and Reactions19
• Oxidation States13
• Isomerism in Coordination Compounds13
• Crystal Field Theory (CFT)7
• Coordination Number and Oxidation State1

Year-wise The d and f Block Elements questions in NEET

Number of questions from this chapter in each year's paper(s).