Question

Zn==>ZnO==>Zn(OH)2==>ZnSO4==>Zn3(PO4)2

Answer 1

2 Zn + O2 → 2 ZnO
ZnO + H2O → Zn(OH)2
Zn(OH)2 + H2SO4 → ZnSO4 + 2 H2O
3 ZnSO4 + 2 H3PO4 → Zn3(PO4)2 ↓ + 3 H2SO4