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In the laboratory, H(2)O(2) is prepared ...

In the laboratory, `H_(2)O_(2)` is prepared by the action of

A

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

B

`BaO_(2)` is added to `CO_(2)` bubbling through 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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