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MHT CET Chemistry question

ChemistryRedox ReactionsMHT CET

In acidic medium, changes to which has two (-O-O-) bonds. Oxidation state of Cr in is

Answer: (C)

Solution

has two peroxide groups (4 O at -1) and one O at -2, so x + 4(-1) + (-2) = 0 gives x = +6; +5

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Question ID VK-065859