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Which statement about sodium peroxide, Na2O2, is incorrect?

1. It is diamagnetic in character
2. It is derived from H2O2
3. In acidic medium, Na2O2 oxidizes Cr3+ to CrO42−
4. It is the superoxide of sodium

Correct answer: It is the superoxide of sodium

Solution

The statement is incorrect because sodium peroxide (Na2O2) is not a superoxide; rather, sodium superoxide (NaO2) is the compound that contains the superoxide ion (O2−). Sodium peroxide contains the peroxide ion (O2²−) instead.

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