The correct sequence of reactions is as follows:

FeS (Iron sulfide) reacts with hydrochloric acid (HCl) to form FeCl2 (Iron(II) chloride) and hydrogen sulfide gas (H2S).FeCl2 reacts with sodium hydroxide (NaOH) to form Fe(OH)2 (Iron(II) hydroxide) and sodium chloride (NaCl).Fe(OH)2 further reacts with more NaOH to form Fe(OH)3 (Iron(III) hydroxide) and NaOH.Fe(OH)3 dehydrates to form Fe2O3 (Iron(III) oxide) and water (H2O).