Q. Which one of the following substances has the highest proton affinity?
A) $H_{2}O$
B) $H_{2}S$
C) $NH_{3}$
D) $PH_{3}$
Explanation
(c)
Proton affinity means affinity for proton $i.e$., basicity. In $NH_{3}$ nitrogen has pair of electron to donate as well as higher tendency to donate due to lower electronegativity. In $PH_{3}$, P is not suitable as that has large size.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.