MHT CET Chemistry question

Which of the following sets of compounds correctly illustrate the law of reciprocal proportions?

Answer: (A)

Solution

For 31 g P, P₂O₃ has 24 g O and PH₃ has 3 g H, giving O : H = 8 : 1, exactly the ratio in H₂O (16 : 2); for

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Question ID VK-041153