Which of the following set is having correct statements?
$1 .$ $H_{2} O_{2}$ is a weak base
$2 . H_{2} O_{2}$ oxidizes Fe (II) to Fe (III)
$3 .$ $H_{2} O_{2}$ can be obtained by the electrolysis of conc. $H_{2} S O_{4}$
$4 . H_{2} O_{2}$ reduces Mn (VII) to Mn (II)

Question

TestHub · Accepted Answer

Here statements 2, 3 and 4 are correct as follows
$H_{2} O_{2}$ is weakly acidic, but more acidic than water.
$H_{2} O_{2} + H_{2} O \to H_{3} O^{+} + H O_{2}^{-}$
$2 F e^{2 +} + H_{2} O_{2} + 2 H^{+} \to 2 F e^{3 +} + 2 H_{2} O$
$H_{2} S O_{4} ⇌ H^{+} + H S O_{4}^{-}$

The peroxy disulphuric acid is hydrolysed separately to get $H_{2} O_{2}$ .
$H_{2} S_{2} O_{8} + H_{2} O \to H_{2} S O_{5} + H_{2} S O_{4}$
$H_{2} S O_{5} + H_{2} O \to H_{2} S O_{4} + H_{2} O_{2}$
$2 M n O_{4}^{-} + 5 H_{2} O_{2} + 6 H^{+} \to 2 M n^{2 +} + 8 H_{2} O + 5 O_{2}$

Chemistry - s Block Elements Question with Solution | TestHub

Options:

Doubts & Discussion