(a) $\mathrm{O} _{2}$ and $\mathrm{P} _{4} \mathrm{O} _{10}$
(b) $\mathrm{O} _{2}$ and $\mathrm{P} _{4} \mathrm{O} _{6}$
(c) $\mathrm{O} _{3}$ and $\mathrm{P} _{4} \mathrm{O} _{6}$
(d) $\mathrm{O} _{3}$ and $\mathrm{P} _{4} \mathrm{O} _{10}$
Correct Answer: 57. (b)
Solution:
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