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  4. Oxidation numbers of P in PO4 3 - , of S in SO42 - and that of Cr in Cr2 O7 2 - respectively are

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Q. Oxidation numbers of P in $PO_4^{ 3 - } $, of $S$ in $SO_4^{2 - }$ and that of $ Cr$ in $Cr_2 O_7^{ 2 - } $ respectively are

AIPMTAIPMT 2009Redox Reactions

Solution:

$PO _{4}^{3-}$, oxidation no. of $P \Rightarrow +5$

$SO _{4}^{2-}$, oxidation no. of $S \Rightarrow +6$

$Cr _{2} O _{7}^{2-}$, oxidation no. of $Cr \Rightarrow +6$