1.

In acidic medium , H_(2)O_(2) changes sigmaCr_(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 :`CrO_(5)` has butterfly structure having two peroxo BONDS.

OXIDATION state of peroxo oxygen `= -1`
`:. `If oxidation state of Cr is x, then
`x+ 4 ( -1) + 1( - 2) = 0` or `x= + 6`


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