Which metal carbide is formed readily by the direct reaction?
Correct answer: D. Lithium
- A. Rubidium
- B. Potassium
- C. Sodium
- D. Lithium
Explanation
Explanation:Lithium carbide is the only alkali metal carbide formed via direct reaction. Rubidium carbide can be formed by reaction with carbon at high temperatures, but it is not as readily formed as lithium carbide. Potassium carbide can be formed by the direct reaction of potassium metal and carbon at high temperatures, but it is not as readily formed as lithium carbide. Sodium carbide can be formed by the direct reaction of sodium metal and carbon, but it is not as readily formed as lithium carbide and requires higher temperatures and pressures.
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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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