NEET Classification of Elements and Periodicity in Properties PYQ practice sheet

8 previous-year NEET Chemistry questions from Classification of Elements and Periodicity in Properties, newest papers first. Classification of Elements and Periodicity in Properties carries 11 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

   Among the following options, the correct trend in the electron gain enthalpy is

   • (A)
     $\mathrm{I > Br > Cl > F}$
   • (B)
     $\mathrm{Br > Cl > F > I}$
   • (C)
     $\mathrm{Cl > F > Br > I}$
   • (D)
     $\mathrm{F > Cl > Br > I}$
2. 2.

   RE-NEET 2026

   Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled $p$ orbital 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
3. 3.

   NEET 2026

   The correct order of increasing metallic character of Na, Be, P, Mg and Si is

   • (A)
     P < Si < Na < Mg < Be
   • (B)
     P < Mg < Be < Si < Na
   • (C)
     P < Si < Be < Mg < Na
   • (D)
     Be < Si < P < Mg < Na
4. 4.

   NEET 2026

   Identify the incorrect statement from the following:

   • (A)
     The similarity in behaviour of Li with Mg is referred to as 'diagonal relationship'.
   • (B)
     The IUPAC name of the element with atomic number 107 is Unnilseptium.
   • (C)
     The largest and the smallest species among Mg, $\mathrm{Mg^{2+}}$, Al and $\mathrm{Al^{3+}}$ are Al and $\mathrm{Mg^{2+}}$ respectively.
   • (D)
     The oxidation state and covalency of Al in $[\mathrm{AlCl(H_2O)_5}]^{2+}$ are 3 and 6, respectively.
5. 5.

   NEET 2024

   Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si Choose the correct answer from the options given below:

   • (A)
     F < O < N < C < Si
   • (B)
     Si < C < O < N < F
   • (C)
     O < F < N < C < Si
   • (D)
     Si < C < N < O < F
6. 6.

   NEET 2024

   Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N Choose the correct answer from options given below:

   • (A)
     Li < Be < N < B < C
   • (B)
     Li < Be < C < B < N
   • (C)
     Li < B < Be < C < N
   • (D)
     Li < Be < B < C < N
7. 7.

   NEET 2023

   The element expected to form largest ion to achieve the nearest noble gas configuration is :

   • (A)
     Na
   • (B)
     O
   • (C)
     F
   • (D)
     N
8. 8.

   NEET 2022

   The IUPAC name of an element with atomic number 119 is:

   • (A)
     ununoctium
   • (B)
     ununennium
   • (C)
     unnilennium
   • (D)
     unununium