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.