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Chemistry · PYQ NEET UG 2022

हिन्दी

Identify the INCORRECT statement from the following.

  1. Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
  2. Lithium is the strongest reducing agent among the alkali metals.
  3. Alkali metals react with water to form their hydroxides.
  4. The oxidation number of K in \( \text{KO}_2 \) is +4.

Correct answer · Option 4

The oxidation number of K in \( \text{KO}_2 \) is +4.

Explanation

In \( \text{KO}_2 \) (potassium superoxide), oxygen exists as superoxide ion \( \text{O}_2^- \), so oxidation number of K is +1, making statement (4) incorrect.
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