AIIMS 2017 Chemistry Ionization Energy MCQ Question with Solution

Which of the following does not represent the correct order of the properties indicated?

A

$\text{O}^{2-} > \text{Ne} > \text{Mg}^{2+} > \text{Al}^{3+}$ (Size)

B

$\text{N}^{3-} > \text{O}^{2-} > \text{F}^- > \text{Na}^+$ (Nuclear charge)

C

$\text{Li} > \text{Be} > \text{B} > \text{C}$ (Electron gain enthalpy)

D

$\text{Li} < \text{Na} > \text{K} > \text{Cs}\ (\text{IE}_1)$

Correct Answer

Option A

Detailed Explanation

Option A is correct because lithium (Li) indeed has a high ionization energy due to its small atomic size, which results in a strong electrostatic attraction between the nucleus and the outermost electron, making it difficult to remove that electron. The statement in option D is incorrect as it misrepresents the relationship between atomic size and ionization energy; smaller atoms typically have higher ionization energies. Other options are not applicable in this context, as they do not provide relevant information or alternative statements to evaluate. Understanding the trends in ionization energy across the periodic table is crucial, as it illustrates how atomic structure influences chemical reactivity.

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AIIMS 2017 Chemistry Ionization Energy MCQ Question

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