The number of H2OH_2OH2O molecules which are involve in Hydrozen bonding in CuSO4⋅5H2OCuSO_4 \cdot 5H_2OCuSO4⋅5H2O molecule itself is
H3PO2H_3PO_2H3PO2
H3PO3H_3PO_3H3PO3
H3PO4H_3PO_4H3PO4
PH3PH_3PH3
(D) PH3PH_3PH3
Explanation: