Question

A molecule of the type $A{X}_5$ has square pyramidal geometry. Hence number of lone pairs on $A$ is:

• A. $4$
• B. $3$
• C. $2$
• D. $1$

Answer 1

Answer: (D)

$1$

Square pyramidal means that sum of lone pair and bond pair is $6$. Here. no. of bonds is $5$.Therefore, $1$ lone pair.