用稀硫酸除铁锈的原理是

$FeO+H_{2}S{O}_4\to FeS{O}_4+H_{2}O$ $F{e}_2{O}_3+3H_{2}S{O}_4\to F{e}_2(S{O}_4{)}_3+3H_2\uparrow$ $F{e}_2{O}_3+3H_{2}S{O}_4\to 2FeS{O}_4+2H_{2}O$ $F{e}_2{O}_3+3H_{2}S{O}_4\to F{e}_2(S{O}_4{)}_3+3H_{2}O$