pBlock ElementsII 1 Question 5
5. The pair that contains two $\mathrm{P}-\mathrm{H}$ bonds in each of the oxoacids is
(2019 Main, 10 Jan II)
(a) $\mathrm{H} _{4} \mathrm{P} _{2} \mathrm{O} _{5}$ and $\mathrm{H} _{4} \mathrm{P} _{2} \mathrm{O} _{6}$
(b) $\mathrm{H} _{3} \mathrm{PO} _{3}$ and $\mathrm{H} _{3} \mathrm{PO} _{2}$
(c) $\mathrm{H} _{4} \mathrm{P} _{2} \mathrm{O} _{5}$ and $\mathrm{H} _{3} \mathrm{PO} _{3}$
(d) $\mathrm{H} _{3} \mathrm{PO} _{2}$ and $\mathrm{H} _{4} \mathrm{P} _{2} \mathrm{O} _{5}$
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Answer:
Correct Answer: 5. (d)
Solution:
- Let us consider the structure of the phosphorus oxyacids,
