NEET The d and f-Block Elements PYQ practice sheet

15 previous-year NEET Chemistry questions from The d and f-Block Elements, newest papers first. The d and f-Block Elements carries 23 of the Chemistry questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   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:

   • (A)
     Both A and R are correct and R is the correct explanation of A
   • (B)
     Both A and R are correct but R is NOT the correct explanation of A
   • (C)
     A is correct but R is not correct
   • (D)
     A is not correct but R is correct
2. 2.

   RE-NEET 2026

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

   • (A)
     $\mathrm{Ce^{3+}}$
   • (B)
     $\mathrm{Ho^{3+}}$
   • (C)
     $\mathrm{Tb^{3+}}$
   • (D)
     $\mathrm{Nd^{3+}}$
3. 3.

   RE-NEET 2026

   The green paramagnetic species formed by heating $\mathrm{KMnO_4}$ at $513$ K is

   • (A)
     $\mathrm{K_2MnO_4}$
   • (B)
     $\mathrm{MnO}$
   • (C)
     $\mathrm{KO_2}$
   • (D)
     $\mathrm{Mn_3O_4}$
4. 4.

   NEET 2026

   Match List I with List II. List I (Transition metal/compound/complex): A. $\mathrm{V_2O_5}$, B. Fe, C. $\mathrm{PdCl_2}$, D. Ni complex List II (Catalytic Role): I. Preparation of ammonia from $\mathrm{N_2/H_2}$ mixture, II. Polymerisation of alkynes, III. Preparation of $\mathrm{H_2SO_4}$ and $\mathrm{SO_2}$, IV. Oxidation of ethyne to ethanal Choose the correct answer from the options given below.

   • (A)
     A-III, B-I, C-IV, D-II
   • (B)
     A-II, B-I, C-IV, D-III
   • (C)
     A-III, B-IV, C-I, D-II
   • (D)
     A-IV, B-I, C-III, D-II
5. 5.

   NEET 2026

   Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:

   • (A)
     After losing one more electron, it acquires $4f^{0}$ electronic configuration.
   • (B)
     Its atomic number is 61.
   • (C)
     Its nearest inert gas is Radon.
   • (D)
     After losing one more electron, it acquires $4f^{14}$ electronic configuration.
6. 6.

   NEET 2026

   The calculated 'spin-only' magnetic moment of $\mathrm{Ti^{2+}}$ ($3d^2$) is:

   • (A)
     5.92 BM
   • (B)
     2.84 BM
   • (C)
     3.87 BM
   • (D)
     4.90 BM
7. 7.

   NEET 2024

   The $E^\circ$ value for the $\mathrm{Mn^{3+}/Mn^{2+}}$ couple is more positive than that of $\mathrm{Cr^{3+}/Cr^{2+}}$ or $\mathrm{Fe^{3+}/Fe^{2+}}$ due to change of

   • (A)
     $d^5$ to $d^4$ configuration
   • (B)
     $d^4$ to $d^5$ configuration
   • (C)
     $d^3$ to $d^5$ configuration
   • (D)
     $d^5$ to $d^2$ configuration
8. 8.

   NEET 2024

   'Spin only' magnetic moment is same for which of the following ions? A. $\mathrm{Ti^{3+}}$ B. $\mathrm{Cr^{2+}}$ C. $\mathrm{Mn^{2+}}$ D. $\mathrm{Fe^{2+}}$ E. $\mathrm{Sc^{3+}}$ Choose the most appropriate answer from the options given below:

   • (A)
     B and C only
   • (B)
     B and D only
   • (C)
     A and D only
   • (D)
     A and E only
9. 9.

   NEET 2024

   The pair of lanthanoid ions which are diamagnetic is

   • (A)
     $\mathrm{Pm^{3+}}$ and $\mathrm{Sm^{3+}}$
   • (B)
     $\mathrm{Gd^{3+}}$ and $\mathrm{Eu^{3+}}$
   • (C)
     $\mathrm{Ce^{4+}}$ and $\mathrm{Yb^{2+}}$
   • (D)
     $\mathrm{Ce^{3+}}$ and $\mathrm{Eu^{2+}}$
10. 10.

    NEET 2023

    The stability of $\mathrm{Cu^{2+}}$ is more than $\mathrm{Cu^{+}}$ salts in aqueous solution due to -

    • (A)
      second ionisation enthalpy.
    • (B)
      first ionisation enthalpy.
    • (C)
      enthalpy of atomization.
    • (D)
      hydration energy.
11. 11.

    NEET 2023

    Which of the following statements are INCORRECT? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $\mathrm{Sc_2O_3}$ to $\mathrm{Mn_2O_7}$. C. Basic character increases from $\mathrm{V_2O_3}$ to $\mathrm{V_2O_4}$ to $\mathrm{V_2O_5}$. D. $\mathrm{V_2O_4}$ dissolves in acids to give $\mathrm{VO_4^{3-}}$ salts. E. CrO is basic but $\mathrm{Cr_2O_3}$ is amphoteric. Choose the correct answer from the options given below :

    • (A)
      B and C only
    • (B)
      A and E only
    • (C)
      B and D only
    • (D)
      C and D only
12. 12.

    NEET 2022

    Gadolinium has a low value of third ionisation enthalpy because of:

    • (A)
      high basic character
    • (B)
      small size
    • (C)
      high exchange enthalpy
    • (D)
      high electronegativity
13. 13.

    NEET 2021

    Zr ($Z = 40$) and Hf ($Z = 72$) have similar atomic and ionic radii because of :

    • (A)
      having similar chemical properties
    • (B)
      belonging to same group
    • (C)
      lanthanoid contraction
    • (D)
      diagonal relationship
14. 14.

    NEET 2021

    The incorrect statement among the following is :

    • (A)
      Actinoids are highly reactive metals, especially when finely divided.
    • (B)
      Lanthanoids are good conductors of heat and electricity.
    • (C)
      Actinoid contraction is greater for element to element than Lanthanoid contraction.
    • (D)
      Most of the trivalent Lanthanoid ions are colorless in the solid state.
15. 15.

    NEET 2020

    The calculated spin only magnetic moment of $\mathrm{Cr^{2+}}$ ion is :

    • (A)
      3.87 BM
    • (B)
      4.90 BM
    • (C)
      5.92 BM
    • (D)
      2.84 BM