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\(K{2}Cr{2}O{7}\) in alkaline medium wit...

\(K_{2}Cr_{2}O_{7}\) in alkaline medium with \(30\%\) \(H_{2}O_{2}\) forms red-brown compound (X). Oxidation state of Cr in 'X' is '+a' and number of peroxy oxygens in 'X' is 'b' .Value of (b-a) is

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