When sodium reacts with excess oxygen on burning, the main product is
Correct answer: C. sodium peroxide, Na2O2
- A. sodium oxide, Na2O
- B. sodium superoxide, NaO2
- C. sodium peroxide, Na2O2
- D. sodium hydroxide, NaOH
Explanation
Lithium forms the simple oxide, sodium forms mainly the peroxide and potassium, rubidium and caesium form superoxides, the larger cations being better able to stabilise the larger anions. Sodium peroxide reacts with water to give hydrogen peroxide and alkali. Sodium hydroxide is the product of reaction with water rather than with oxygen.
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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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