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Calculate the oxidation number of Cr in ...

Calculate the oxidation number of Cr in `Cr_(2)O_(7)^(2-)`.

Text Solution

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Let the oxidation number of Cr be x.
Sum of oxidation numbers of all atoms = Total charge on ion.
`[(x,-2),(Cr_(2),O_(7))]^(2-)`
`(x xx 2) + (-2 xx 7) = - 2`
2x + (-14) = -2
2x - 14 = -2
2x = 12
x = 6
`therefore` oxidation number of Cr in `Cr_(2)O_(7)^(2-)` is +6.
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Knowledge Check

  • Oxidation number of Cr in Cr(CO)_(6) is

    A
    -2
    B
    `+2`
    C
    `+6`
    D
    0

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