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Preparations and Reactions of Sodium Oxide

Peroxides of ...

Question

Peroxides of group IA metals are

Thermally stable even at high temperatures

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Diamagnetic

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Paramagnetic

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unreactive towards strong acids

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Solution

The correct option is B
Diamagnetic

$O_{2}^{2 -}$ has $16 x^{2} + 2 = 34$ electrons where all are paired. Hence alkali metal peroxides are diamagnetic. Statements a) and d) are incorrect. Peroxides decompose at high temperatures while they are highly reactive towards strong acids.

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