# Iron reacts with $P_4O_{10}$ in the presence of $O_2$ at a high temp to produce.

$(a)\;Fe_3P\\(b)\;Fe_3(PO_3)_2 \\(c)\;FePO_4 \\ (d)\;Fe_3(PO_4)_2$

Iron reacts with $P_4O_{10}$ in the presence of $O_2$ at a high temp to produce $Fe_3(PO_4)_2$
Hence d is the correct answer.