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In the following unbalanced redox reaction,
P
W \( \mathrm{Cu}_{3} \mathrm{P}+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \rightarrow \mathrm{Cu}^{2+}+\mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{Cr}^{3+} \),
the equivalent weight of \( \mathrm{H}_{3} \mathrm{PO}_{4} \) is
(a) \( \mathrm{M} / 3 \)
(b) \( \mathrm{M} / 6 \)
(c) \( \mathrm{M} / 7 \)
(d) \( \mathrm{M} / 8 \)
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