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Which one of the alkali metals forms only the normal oxide, M2O, on heating in air?

1. Rb
2. K
3. Li
4. Na

Correct answer: Li

Solution

Lithium (Li) forms only the normal oxide (Li2O) when heated in air due to its small size and high charge density, which stabilizes the oxide ion (O2-). Other alkali metals form peroxides or superoxides under similar conditions.

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