For preparing H(2)O(2),....

For preparing `H_(2)O_(2)`,__________.

A

`MnO_(2)` is added to dilute cold `H_(2)SO_(4)`

B

`CO_(2)` is bubbled through a paste of `BaO_(2)` in cold water

C

`PbO_(2)` is added to an acidified solution of `KMnO_(4)`

D

`Na_(2)O_(2)` is added to boiling water

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The correct Answer is:

B

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