Answer:
In the preparation of \[{{H}_{2}}{{O}_{2}}\]
from barium peroxide and sulphuric acid, the use of sulphuric acid has a
disadvantage as it catalyses the decomposition of \[{{H}_{2}}{{O}_{2}}\]
formed. In place of\[{{H}_{2}}{{O}_{2}}\], weak acids like ortho phosphoric
acid, carbonic acid are preferred. All heavy metal impurities present in\[Ba{{O}_{2}}\]
are removed as insoluble phosphates and decomposition of \[{{H}_{2}}{{O}_{2}}\]is
prevented.
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