Question

1)S→ SO2→ SO3→ H2SO4→ BaSO4
2)FeCl3→ Fe(OH)3→ Fe2O3→ Fe

Answer 1

S+O2=SO2
2SO2+O2=2SO3
SO3+H2O=H2SO4
H2SO4+Ba(OH)2=BaSO4+2H2O

FeCl3+3NaOH=Fe(OH)3+3NaCL
2Fe(OH)3--->Fe2O3+3H2O
Fe2O3+2AL-->AL2O3+2Fe