Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Question Explanation:

Determining maximum s-character in central atom lone pairs.

Concept:

Drago's Rule and Hybridization

Solution:

According to Drago's rule, in third-period elements like phosphorus ( ${\mathrm{PH}}_3$ ), hybridization does not occur significantly, and the lone pair remains in a pure s-orbital ( $100\%\mathrm{s}$-character).

In contrast, second-period elements like N and O undergo ${\mathrm{sp}}^3$ hybridization, reducing s-character to $\approx 25\%$.

Final Answer: Option (C)