NEET 2026 (Phase 1) · ChemistryPrevious Year Question

Identify the incorrect statement from the following:

Answer: (B) (b) The oxidation number of K in $KO X_{2}$ is $+ 4$ . \textbf{Answer:} (b) The oxidation number of K in $KO X_{2}$ is $+ 4$ \textbf{Solution:} The oxidation number of K in $KO X_{2}$ (potassium superoxide) is not $+ 4$ ; potassium is always $+ 1$ .

A.(a) Alkali metals react with water to form their hydroxides
B.(b) The oxidation number of K in $KO X_{2}$ is $+ 4$ ✓
C.(c) Ionisation enthalpy of alkali metals decreases from top to bottom in the group
D.(d) Lithium is the strongest reducing agent among the alkali metals

Correct Answer

(B) (b) The oxidation number of K in $KO X_{2}$ is $+ 4$

Solution & Explanation

\textbf{Answer:} (b) The oxidation number of K in $KO X_{2}$ is $+ 4$ \textbf{Solution:} The oxidation number of K in $KO X_{2}$ (potassium superoxide) is not $+ 4$ ; potassium is always $+ 1$ . The superoxide ion $O X_{2} X^{-}$ carries an overall $- 1$ charge, so each O is $- 1/2$ and K is $+ 1$ . Statements (a), (c) and (d) are correct properties of alkali metals. Hence statement (b) is the incorrect one.

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