Q. Identify the incorrect statement from the following
A) Lithium is the strongest reducting agent among the alkali metals.
B) Alkali metals react with water to form their hydroxides.
C) The oxidation number of K in $KO_2$ is +4.
D) Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
Explanation
[Solution] $KO_2$ is potassium superoxide ($K^+O_2^-$); the oxidation number of K is +1. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.