Question

$H_2{O}_2$ can be obtained when following reacts with $H_{2}S{O}_4$ except with_______.

• A. $Pb{O}_2$
• B. $Ba{O}_2$
• C. $N{a}_2{O}_2$
• D. $Sr{O}_2$

Answer 1

The correct option is A $Pb{O}_2$

The laboratory preparation of hydrogen peroxide was based on the technique that Thenard used. In this technique, barium nitrate, purified by recrystallization, was decomposed by heating in air in a porcelain retort. The resulting oxide was further oxidized by heating in a stream of oxygen to a dull red heat. The barium peroxide which formed was then dampened, ground, and dissolved in hydrochloric acid. A slight excess of sulfuric acid was then added to precipitate barium sulfate and regenerate hydrochloric acid. The procedure of barium peroxide solution and sulfate precipitation was repeated several times in the same solution to increase the peroxide concentration. But $Pb{O}_2$ can not be used in this process instead of $Ba{O}_2$.

Reaction:

$Ba{O}_2.8H_{2}O+H_{2}S{O}_4\to BaS{O}_4+H_2{O}_2+8H_{2}O$.