Question

Na₂O₂-

• A. Is diamagnetic in nature
• B. Is salt of dibasic acid H₂O₂
• C. Oxidizes Cr³⁺ (green) to CrO${}_{4}^{2 -}$ (yellow)
• D. All are correct properties of Na₂O₂

Answer 1

Answer: (D)

All are correct properties of Na₂O₂

Answer 2

Na₂O₂ has peroxide ion O${}_{2}^{2 -}$ (18e^–).

It has all paired electrons and is thus diamagnetic.

H₂O₂ ® 2H⁺ + O${}_{2}^{2 -}$

Thus, it is also salt of dibasic acid H₂O₂ . Cr³⁺ is oxidised to CrO${}_{4}^{2 -}$in acidic medium

Cr³⁺ + $O_{2}^{2 -}$+ 2H⁺ ® CrO${}_{4}^{2 -}$+ H₂O