In which of the following reaction there is no change in oxidation sta

1.	In which of the following reaction there is no change in oxidation state
Answer» `2H_(2)O_(2) to 2H_(2)O+O_(2)` `CaCO_(3) to CaO+CO_(2)` `2H_(2)O to 2H_(2)+O_(2)` `2HgO to 2Hg+O_(2)` Answer :B

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