Question

A molecule AX$_2$ has two lone pairs over A. Its shape is

• A. Tetrahedral
• B. Pyramidal
• C. Angular
• D. Linear

Hint:

Electron pair geometry may differ from molecular shape—lone pairs repel more strongly and change the shape.

Answer 1

The Correct Option is C

Step 1: Identify the number of electron pairs around the central atom A. AX$_2$ with two lone pairs means: \[ \text{Bond pairs} = 2,\quad \text{Lone pairs} = 2 \]
Step 2: Total electron pairs around A: \[ 2 + 2 = 4 \]
Step 3: According to VSEPR theory, 4 electron pairs give a tetrahedral electron pair geometry.
Step 4: However, the molecular shape depends only on the positions of bonded atoms, not lone pairs.
Step 5: With two bonded atoms and two lone pairs, the shape becomes bent or angular.
Step 6: Therefore, the correct shape is Angular.