Question

write the formula of the compound of phosphorus which is obtained when conc.HNO3 oxidises p4

Answer 1

H3PO4.....................

Answer 2

Answer: The formula of the compound of phosphorus obtained will be $H_3PO_4$

Explanation:

$P_4$ can be readily oxidized and therefore it acts as a strong reducing agent. This compound reduced $HNO_3\text{ to }NO_2$

The equation for the reaction of $HNO_3$ and $P_4$ follows:

$P_4+20HNO_3\rightarrow 20NO_2+4H_3PO_4+4H_2O$

The compound of phosphorous formed in the above reaction is $H_3PO_4$