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Calculate the O.N of (i) Cr "in" K(2)C...

Calculate the O.N of
`(i) Cr "in" K_(2)CrO_(4)`
`(ii) S "in" H_(2)SO_(4)`
`(iii)S "in" NaHSO_(4)`
`N "in" HNO_(3)`
`(iv)P "in" H_(3)PO_(4)`

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