pBlock ElementsII 1 Question 19
19. The reaction of $\mathrm{P} _{4}$ with $X$ leads selectively to $\mathrm{P} _{4} \mathrm{O} _{6}$. The $X$, is
(2009)
(a) dry $\mathrm{O} _{2}$
(b) a mixture of $\mathrm{O} _{2}$ and $\mathrm{N} _{2}$
(c) moist $\mathrm{O} _{2}$
(d) $\mathrm{O} _{2}$ in the presence of aqueous $\mathrm{NaOH}$
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Answer:
Correct Answer: 19. (b)
Solution:
- In limited supply of oxygen, phosphorus is oxidised to its lower oxide $\mathrm{P} _{4} \mathrm{O} _{6}$ while excess of oxygen gives $\mathrm{P} _{4} \mathrm{O} _{10}$. A mixture of $\mathrm{O} _{2}$ and $\mathrm{N} _{2}$ is used for controlled oxidation of phosphorus into $\mathrm{P} _{4} \mathrm{O} _{6}$.
