Lithium reacts with air to form:
Correct answer: D. Both (a) & (b)
- A. Li2O
- B. Li2N
- C. Li2O2 + Li2CO3
- D. Both (a) & (b)
Explanation
Lithium reacts with the oxygen in the air to form lithium oxide (Li2O) and with nitrogen to form lithium nitride (Li3N). These reactions occur when lithium is heated in the air, and both products are formed as a result of these reactions. Therefore, the correct answer is 'Both (a) & (b)', indicating that both lithium oxide and lithium nitride are produced.Option A and Option B are partially correct because they only consider one aspect of the reaction. Option C is incorrect because Li2O2 and Li2CO3 are not the direct products of lithium reacting with air.
This question appeared on the ETEA MDCAT 2016 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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