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Which of the following sets of compounds...

Which of the following sets of compounds correctly illustrate the law of reciprocal proportions ?
(1) `P_2O_3. PH_3, H_2O`
(2) `P_2O_5, PH_3, H_2O`
(3) `N_2O_5, NH_3, H_2O`
(4) `N_2O, NH_3, H_2O`
(5) `NO_2, NH_3, H_2O`

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