Logo
Jeeify
MCQMediumJEE 2025Electron Gain Enthalpy & Electronegativity

JEE Chemistry 2025 Question with Solution

Match List-I with List-II:

Two-column matching table. List-I has A) Al3+ < Mg2+ < Na+ < F−, B) B < C < O < N, C) B < Al < Mg < K, D) Si < P < S < Cl. List-II has I) Ionisation Enthalpy height, II) Metallic character height, III) Electronegativity height, IV) Ionic radii height.
  • A

    A-IV, B-I, C-III, D-II

  • B

    A-II, B-III, C-IV, D-I

  • C

    A-IV, B-I, C-II, D-III

  • D

    A-III, B-IV, C-II, D-I

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: A matching question on periodic trends with List-I and List-II.

Find: The correct one-to-one correspondence between A, B, C, D and I, II, III, IV.

Use the periodic trends mentioned in the solution: ionic radii, ionisation enthalpy, metallic character, and electronegativity.

From the extracted solution, the correct matching is:

A→IVB→IC→IID→III\begin{aligned} A &\to IV \\ B &\to I \\ C &\to II \\ D &\to III \end{aligned}

Therefore, the final correspondence is A-IV, B-I, C-II, D-III.

Hence, the correct option is C.

Using Periodic Trends

Given:

  • A) Al3+<Mg2+<Na+<F−\mathrm{Al^{3+} < Mg^{2+} < Na^{+} < F^{-}}
  • B) B<C<O<N\mathrm{B < C < O < N}
  • C) B<Al<Mg<K\mathrm{B < Al < Mg < K}
  • D) Si<P<S<Cl\mathrm{Si < P < S < Cl}

Find: Which property each sequence represents.

  1. A is matched with ionic radii. The hint explicitly states that ionic radii depend on charge and size of ions, and the extracted solution gives
A→IVA \to IV
  1. B is matched with ionisation enthalpy. The hint says ionisation energy generally increases across a period, with the known anomaly giving the listed order, so
B→IB \to I
  1. C is matched with metallic character. Metallic character increases down a group and decreases across a period, therefore the extracted answer gives
C→IIC \to II
  1. D is matched with electronegativity. Electronegativity increases across a period, so
D→IIID \to III

Thus,

A→IVB→IC→IID→III\begin{aligned} A &\to IV \\ B &\to I \\ C &\to II \\ D &\to III \end{aligned}

Therefore, the correct option is C.

Common mistakes

  • Confusing ionic radii with atomic radii. The order in A is for ions, where charge strongly affects size. Use ionic size trends for isoelectronic or charged species, not neutral-atom radius trends.

  • Assuming ionisation enthalpy always increases strictly across a period without exceptions. In B, common exceptions such as N and O matter. Check electronic configuration before applying the trend mechanically.

  • Mixing up metallic character and electronegativity. Metallic character increases down a group and toward the left, whereas electronegativity increases across a period toward the right. Keep these opposite trends separate while matching C and D.

Practice more Electron Gain Enthalpy & Electronegativity questions

Get unlimited AI-adaptive practice, mastery tracking, and an AI tutor that explains every step — free to start.

Start free trialMore on Electron Gain Enthalpy & Electronegativity

Related questions