A metal `X` is found in the form of filings which burns vigorously when sprinkle on flame. When these filings are treated with sulphur a black colured compound `Y` is formed which is not attracted by magnet. `X` reacts with dil HCl to liberate hydrogen gas. `X` reacts with steam to form `Z` along with hydrogen gas. Identify `X`, `Y`, and `Z`. Write the reaction involved.

The element X is iron. Iron filings burn vigorously when sprinkled on flame. These react with sulphur powder to form ferrous sulphide, which is a chemical compound with the formula FeS. Following is the chemical equation for the reaction

Fe + S → FeS

Iron reacts with dilute hydrochloric acid to form ferrous chloride and hydrogen gas. Following is the chemical equation for the reaction

Fe + 2HCl → FeCl2 + H2

Iron reacts with steam to form Fe3O4 and hydrogen gas. Following is the chemical equation for the reaction

3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4H2 (g)

Thus, X is iron, Y is FeS and Z is Fe3O4.

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