COMEDK 2024 Shift 2 Paper

Pauling's Electronegativity scale is a widely used method to determine the relative electronegativities of elements. Electronegativity is a measure of an atom's ability to attract and hold electrons in a chemical bond. Generally, electronegativity increases across a period in the periodic table (from left to right) and decreases down a group (from top to bottom).
Let's evaluate each option based on Pauling's Electronegativity scale:
Option A
Na>Cs>K
Sodium ( Na ), Cesium (Cs), and Potassium (K) are all alkali metals. Electronegativity decreases as we go down the group. Hence, the correct order should be:
Na>K>Cs
So, this option is incorrect.
Option B
Mg>Al>Si
Magnesium (Mg), Aluminium (Al), and Silicon (Si) belong to different groups. Typically, moving across a period from left to right, electronegativity increases. Hence, the correct order should be:
Si>Al>Mg
So, this option is also incorrect.
Option C
B>C>Al
Boron (B), Carbon (C), and Aluminium (Al) are from different periods and groups. Typically, Carbon (C) is more electronegative than Boron (B), and both Boron (B) and Carbon (C) are more electronegative than Aluminium (Al):
C>B>Al
So, this option is incorrect.
So, this option is incorrect.
Option D
N>S>P
Nitrogen (N), Sulfur (S), and Phosphorus (P) are in different groups and periods. Generally, within the same period, electronegativity increases from left to right (N>S), and within the same group, it decreases down the group ( S>P ):
N>S>P
This option follows the rules of electronegativity correctly.
Therefore, the correct option is:
Option D
N>S>P