Oxidation numbers of \( \mathrm{P} \) in \( \mathrm{PO}_{4}^{3-} \), of \( \mathrm{S} \) in \( \...

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Oxidation numbers of \( \mathrm{P} \) in \( \mathrm{PO}_{4}^{3-} \), of \( \mathrm{S} \) in \( \mathrm{SO}_{4}^{2-} \) and that of \( \mathrm{Cr} \) in \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) are respectively
(a) \( +3,+6 \) and \( +5 \)
(b) \( +5,+3 \) and \( +6 \)
(c) \( -3,+6 \) and \( +6 \)
(d) \( +5,+6 \) and \( +6 \)
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