Medium MCQ +4 / -1 PYQ · JEE Mains 2024

Given below are two statements :

Statement I : The correct order of first ionization enthalpy values of $\mathrm{Li}, \mathrm{Na}, \mathrm{F}$ and $\mathrm{Cl}$ is $\mathrm{Na}<\mathrm{Li}<\mathrm{Cl}<\mathrm{F}$.

Statement II : The correct order of negative electron gain enthalpy values of $\mathrm{Li}, \mathrm{Na}, \mathrm{F}$ and $\mathrm{Cl}$ is $\mathrm{Na}<\mathrm{Li}<\mathrm{F}<\mathrm{Cl}$

In the light of the above statements, choose the correct answer from the options given below :

  1. A Statement I is true but Statement II is false
  2. B Both Statement I and Statement II are false
  3. C Statement I is false but Statement II is true
  4. D Both Statement I and Statement II are true Correct answer

Solution

<p>First ionization enthalpy of $\mathrm{F}>\mathrm{Cl}$ as first IE decreases down the group.</p> <p>Similarly, first IE of $\mathrm{Li}>\mathrm{Na}$.</p> <p>So, statement-I is correct.</p> <p>Electron gain enthalpy of given elements are negative. Considering the magnitude the given order is correct.</p> <p>Thus, statement-II is correct</p>

About this question

Subject: Chemistry · Chapter: Periodic Table and Periodicity · Topic: Periodic Trends

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