Which element can form super oxides?
Correct answer: D. All of the above
- A. Cs
- B. Rb
- C. K
- D. All of the above
Explanation
Alkali metals form oxides (O²⁻), peroxides (O₂²⁻), or superoxides (O₂⁻) depending on their size.Larger cations stabilize larger anions:Li → only forms Li₂O (oxide)Na → forms Na₂O₂ (peroxide)K, Rb, Cs → form superoxides (O₂⁻)Answer: K, Rb, and Cs can all form superoxides.
This question appeared on the KMU Centralized Admission Test 2021 paper, which you can sit online with every answer explained.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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