Final answer:
Hydrogen peroxide can be prepared by reacting barium peroxide with sulfuric acid. This reaction produces barium sulfate as a byproduct, along with the desired hydrogen peroxide. Other methods listed are not standard for producing hydrogen peroxide.
So option (1) is the correct answer.
Step-by-step explanation:
Hydrogen peroxide can be prepared industrially and in the laboratory by various methods. Among the options provided, hydrogen peroxide is prepared by reacting barium peroxide with sulfuric acid, according to the reaction: BaO2 + H2SO4 → BaSO4 + H2O2. This method involves the use of barium peroxide, which reacts with sulfuric acid to produce barium sulfate as a byproduct and hydrogen peroxide. The other methods listed, such as reacting hydrogen with oxygen or water with oxygen, do not typically form hydrogen peroxide. Moreover, reacting sodium peroxide with hydrochloric acid yields a different set of products, including sodium chloride and oxygen.
To clarify further, here is how some of the reactions mentioned operate:
Producing hydrogen gas commonly involves the reaction of a dilute strong acid, like hydrochloric acid, with an active metal.
Producing halides such as hydrogen chloride and hydrogen bromide can involve the direct reaction of hydrogen with halogens or through other preparation methods.
The decomposition of hydrogen peroxide can be accelerated with the help of a catalyst, such as manganese (IV) oxide, which provides an alternate reaction pathway with a lower activation energy.