First slide

Alkali metals

Question

Which of the following liberates O₂ upon hydrolysis?

Moderate

A

Pb₃O₄
B

KO₂
C

Na₂O₂
D

Li₂O₂

Solution

(A) Pb₃O₄ is insoluble in water or do not react with water.
$(B) 2 {KO}_{2} + 2 H_{2} O \to 2 KOH + H_{2} O_{2} + O_{2 (g)} ↑$
$(C) {Na}_{2} O_{2} + 2 H_{2} O \to 2 NaOH + H_{2} O_{2}$
$(D) {Li}_{2} O_{2} + 2 H_{2} O \to 2 LiOH + H_{2} O_{2}$

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