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Which one of the following sets of compounds
P correctly illustrates the law of reciprocal

W proportions?
(A) \( \mathrm{P}_{2} \mathrm{O}_{3}, \mathrm{PH}_{3}, \mathrm{H}_{2} \mathrm{O} \)
(B) \( \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{PH}_{3}, \mathrm{H}_{2} \mathrm{O} \)
(C) \( \mathrm{N}_{2} \mathrm{O}_{5}, \mathrm{NH}_{3}, \mathrm{H}_{2} \mathrm{O} \)
(D) \( \mathrm{N}_{2} \mathrm{O}, \mathrm{NH}_{3}, \mathrm{H}_{2} \mathrm{O} \)
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