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JEE Main levelSingle correct optionDifficulty 2 of 3sb122

Sodium peroxide reacts with ice-cold water to form:

A $NaOH and H X_{2} O X_{2}$
B $NaOH and O X_{2}$
C $Na X_{2} O and H X_{2} O X_{2}$
D $NaOH and H X_{2}$

Answer: A

At low temperature hydrolysis of the peroxide ion gives hydrogen peroxide:

Na X_{2} O X_{2} + 2 H X_{2} O 2 NaOH + H X_{2} O X_{2}

. In hot water the

H X_{2} O X_{2}

decomposes and

O X_{2}

is evolved:

2 Na X_{2} O X_{2} + 2 H X_{2} O 4 NaOH + O X_{2}

.

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