1.

In acidic medium , H_(3)O_(2) changes Cr_(2)O_(7)^(-2)"to"CrO_(5) "Which has two (-O-O-) bonds.Oxidation state of Cr in" CrO_(5) is

Answer»

`+5`
`+3`
`+6`
`-10`

SOLUTION :O.N of CR may be calculated as:
`x+4(-1)+(-2)= or x=6 `


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