Question

When one mole of hydrogen peroxide reacts with one mole of sodium hydroxide, it forms :

• A. Sodium peroxide.
• B. Sodium hydroperoxide.
• C. Sodium oxide.
• D. (b) and (c) above.

Answer 1

The correct option is B Sodium hydroperoxide.

When one mole of hydrogen peroxide reacts with one mole of sodium hydroxide, it forms an acidic salt (sodium hydroperoxide)
The reaction is :
$NaOH+H_2{O}_2⟶\underset{\text{Sodium hydroperoxide}}{NaH{O}_2}+H_{2}O$
Theory :
Acidic nature:
Anhydrous hydrogen peroxide is acidic in nature ($K_a=1.55\times {10}^{-12}$ at 298 K)
Its dissociation in an aqueous solution may be given as:
$H_2{O}_2+H_{2}O\to H_3{O}^{+}H{O}_2^{-}$
Two types of salts are formed:
Acidic Salt:
$NaOH+H_2{O}_2\to \underset{\text{Sodium hydroperoxide}}{NaH{O}_2}+H_{2}O$
Normal Salt:
$2NaOH+H_2{O}_2\to \underset{\text{Sodium peroxide}}{N{a}_2{O}_2}+2H_{2}O$