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Question

Peroxides of group IA metals are 
  1. Paramagnetic

  2. unreactive towards strong acids

  3. Thermally stable even at high temperatures

  4. Diamagnetic


Solution

The correct option is D

Diamagnetic


O22 has 16x2+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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