In which of the following oxoanions the oxidation state of central atom is not same as that of its group number in periodic table ?
In which of the following oxoanions the oxidation state of central atom is not same as that of its group number in periodic table ?
A. `MnO_4^(-)`
B. `Cr_2O_7^(2-)`
C. `VO_4^(3-)`
D. `FeO_4^(2-)`
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Correct Answer - D
(A)`MnO_4^(-)=+7, [Ar]^(18)3d^(5)4s^(2)=7`
(B)`Cr_2O_7^(2-)=+6, [Ar]^(18)3d^(5)4s^(1)=6`
(C )`VO_4^(3-)=+5, [Ar]^(18)3d^(3)4s^(2)=5`
(D)`FeO_4^(2-)=+6, [Ar]^(18)3d^(6)4s^(2)=8`
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