AIIMS2018Chemistry-Periodic Table

AIIMS 2018 Chemistry p-block Elements MCQ Question

Type: MCQ-conceptual-Medium-Class 11

First three ionisation energies (in kJ/mol\text{kJ/mol}) of three representative elements are given below:

ElementIE1\text{IE}_1IE2\text{IE}_2IE3\text{IE}_3
P495.845626910
Q737.714517733
R577.518172745

Then incorrect option is:

A

Q: Alkaline earth metal

B

P: Alkali metals

C

R: s-block element

D

They belong to same period

Correct Answer

Option C

Detailed Explanation

The element R is a p-block element, and the relatively small difference between the second ionization energy (IE₂) and the third ionization energy (IE₃) indicates that it can lose more than two electrons relatively easily, suggesting that its stable oxidation state is higher than +2. This behavior is characteristic of elements that can achieve a stable electronic configuration by losing additional electrons, often leading to oxidation states of +3 or higher. The other options are not applicable as they do not provide relevant information or alternatives regarding the oxidation states of p-block elements.

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