The compound obtained on reaction of iron with steam is/are :(a) $\mathrm{Fe}_2\mathrm{O}_3$(b) $\mathrm{Fe}_3\mathrm{O}_4$(c) $\mathrm{FeO}$(d) $\mathrm{Fe}_2\mathrm{O}_3$ and $\mathrm{Fe}_3\mathrm{O}_4$ORAn element ' $X$ ' reacts with $\mathrm{O}_2$ to give a compound with a high melting point. This compound is also soluble in water. The element ' $X$ ' is likely to be :(a) iron(b) calcium(c) carbon(d) silicon