Which one of the alkali metals, forms only, the normal oxide, M _2 O on heating in air

NEET 2012 Chemistry question

Not in JEE Main or NEET syllabus

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

Answer: (4)

Lithium, being very small and strongly polarising, forms only the normal oxide on burning in air: (with some

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Question ID VK-091141