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AIIMS 2017 Chemistry Ionization Energy MCQ Question

Type: MCQ-conceptual-Easy-Class 11

Arrange the elements SeSe, ClCl and SS in the increasing order of ionisation energy

A

Se<S<Cl\text{Se} < \text{S} < \text{Cl}

B

S<Se<Cl\text{S} < \text{Se} < \text{Cl}

C

Cl<S<Se\text{Cl} < \text{S} < \text{Se}

D

Se<Cl<S\text{Se} < \text{Cl} < \text{S}

Correct Answer

Option B

Detailed Explanation

Ionization energy increases across a period due to increasing nuclear charge, which holds electrons more tightly, making it harder to remove them. Therefore, chlorine (Cl), being to the right of sulfur (S), has a higher ionization energy than sulfur, while selenium (Se), being below sulfur in the same group, has a lower ionization energy due to increased electron shielding and distance from the nucleus. This establishes the order S < Se < Cl. Other options are incorrect because they either misplace the relative energies or do not account for the periodic trends correctly.

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