Q10 / 200 · Manipal (MET) 2011 · Chemistry

Concentrated nitric acid $\left(\mathrm{HNO}_3\right)$ oxidises phosphorus to

Correct answer
A
$\mathrm{H}_3 \mathrm{PO}_4$
B
$\mathrm{H}_3 \mathrm{PO}_3$
C
$\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7$
D
$\mathrm{H}_3 \mathrm{PO}_2$

Solution

$\mathrm{P}_4+20 \mathrm{HNO}_3 \longrightarrow 4 \mathrm{H}_3 \mathrm{PO}_4+20 \mathrm{NO}_2+4 \mathrm{H}_2 \mathrm{O}$

Hence, the correct answer is option: 'A'.

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