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NEET2022Chemistrys Block ElementsActual

Identify the incorrect statement from the following

Options

  1. AThe oxidation number of K in KO 2 is + 4 .
  2. BIonisation enthalpy of alkali metals decreases from top to bottom in the group.
  3. CLithium is the strongest reducing agent among the alkali metals.
  4. DAlkali metals react with water to form their hydroxides.

Correct answer

A. The oxidation number of K in KO 2 is + 4 .

Step-by-step solution

The oxidation number for alkali metals is 1 . As potassium K is also on alkali metal, so its oxidation state will be 1 in all of its compounds. KO 2 is potassium superoxide. Here oxygen is in   - 1 2 oxidation state.

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