Question

When potassium is reacted with oxygen, which of the following compound(s) is/are formed?

• A. ${\text{K}}_{\text{2}}\text{O}$
• B. ${\text{KO}}_{\text{2}}$
• C. Both ${\text{K}}_{\text{2}}\text{O}$ and ${\text{KO}}_{\text{2}}$
• D. ${\text{K}}_{\text{2}}{\text{O}}_{\text{2}}$

Answer 1

Answer: (B)

Various alkali metals react with oxygen to give different types of compounds. Lithium reacts with oxygen to form simple oxides (Li₂O), Sodium reacts to form peroxides (Na₂O₂) while potassium, rubidium and caesium form superoxides (MO₂).

Hence, correct answer will be KO₂.