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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

Cold `H_(2)SO_(4)` on `BaO_(2)`

B

Aqueous alkali on `Na_(2)O_(2)`

C

`MnO_(2)` and cold `H_(2)SO_(4)`

D

Dilute HCl and `MnO_(2)`

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The correct Answer is:
A
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