P—>P2O5–>H3PO4–>

Question

P—>P2O5–>H3PO4–><—Ca3(PO4)2<—Ca(OH)2<—CaO<—Ca

Answer 1

4P + 5O2 = 2P2O5

P2O5 + 3H2O = 2H3PO4

3Ca(OH)2 + 2H3PO4 = Ca3(PO4)2 + 6H2O

Ca3(PO4)2 + 6HCl = 3CaCl2 + 2H3PO4

CaCl2 + 2NaOH = Ca(OH)2 + 2NaCl

Ca(OH)2 (t)= CaO + H2O

CaO + H2 (t)= Ca + H2O