Among the following, the number of compounds that can react with PCl5 to give POCl3 is O2,CO2,SO2,H2O,H2SO4,P4O10.
PCl5 produces POCl3 with the following reagents:
PCl5+SO2→POCl3+SOCl2
PCl5+H2O→POCl3+2HCl
2PCl5+H2SO4→SO2Cl2+2POCl3+2HCl
6PCl5+P4O10→10POCl3