Fe(OH)3 - Fe2O3
KNO2 => K2O - N2O3
H2SO4=> SO3 - H2O
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1) Fe(OH)3 - Fe2O32) KNO2 - K2O + N2O3
3) H2SO4 - H2O + SO3
Fe(OH)3 - Fe2O3
KNO2 => K2O - N2O3
H2SO4=> SO3 - H2O