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Q.

Identify the incorrect statement from the following

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a

Lithium is the strongest reducing agent among the alkali metals.

b

Alkali metals react with water to form their hydroxides.

c

The oxidation number of K in KO2 is +4.

d

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

answer is A.

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Detailed Solution

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Oxidation state of K in KO2 is +1. Potassium (K) is an alkali metal and alkali metals show +1 oxidation state because of having single electron in the outermost shell. Therefore, oxidation state of K in KO2 is +1 and it forms compound KO2 with O2 - (superoxide) because oxidation state of O2 in KO2 is -1.
KO2 is potassium superoxide.

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Identify the incorrect statement from the following