In the laboratory preparation of hydrogen peroxide, why is hydrated barium peroxide () specifically preferred over anhydrous barium peroxide () when reacting with dilute sulphuric acid?

Question

In the laboratory preparation of hydrogen peroxide, why is hydrated barium peroxide ($BaO_2 \cdot 8H_2O$) specifically preferred over anhydrous barium peroxide ($BaO_2$) when reacting with dilute sulphuric acid?

Prashant Kotian · Accepted Answer

Correct answer: C. During the reaction , insoluble is formed. If anhydrous is used, this insoluble precipitate forms a thin, protective layer around the unreacted , choking off the acid supply and stopping the reaction. Hydrated barium peroxide avoids this surface coating issue.

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