Oxidation numbers of P in PO43−PO_4^{3-}PO43−, of S in SO42−SO_4^{2-}SO42− and that of Cr in Cr2O72−Cr_2O_7^{2-}Cr2O72− are respectively
+3, +6 and +5
+5, +3 and +6
–3, +6 and +6
+5, +6 and +6
(D) +5, +6 and +6
Explanation:
