Sn → SnO → Sn(NO3)2 → Sn(OH)2 → Na2SnO2 → SnSO4 → SnCl2.
2Sn+O2=2SnO SnO+2HNO3 Sn (NO3)2+2H2O=Sn (OH)2+2H NO3 Sn (OH)2+2Na=Na2SnO2+H2 Na2SnO2+H2SO4=H2O+SnSO4+NaO SnSO4+2HCI=SnCI2+H2SO4