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Identify the incorrect statement from the following

Option 1 -

Alkali metals react with water to form their hydroxides.

Option 2 -

The oxidation number of K in KO₂ is +4.

Option 3 -

Ionisation enthalpy of alkali metals decreases from top to bottom in the group.

Option 4 -

Lithium is the strongest reducing agent among the alkali metals.

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