A metal 'X' is found in form of filing which burns vigorously when sprinkled on flame when these filings are heated with sulphur, a black coloured compound 'Y' is formed which is not attracted by magnet 'X' reacts with dil HCl to hydrogen gas 'X' reacts with steam to form 'Z' along with hydrogen gas. Identify 'X', 'Y' and 'Z' and write the chemical reactions involved?

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Solution

Elements 'X' is iron. Iron fillings burn vigorously when sprinkled on the flame. These react with sulphur to form ferrous sulphide which is a black colored compound.
$F e + S \to F e S$
Iron reacts with dil HCl to form ferrous chloride and hydrogen gas.
$F e + 2 H C l \to F e C l_{2} + H_{2}$
Iron reacts with steam to form $F e_{3} O_{4}$ and hydrogen gas
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$
So X is iron, Y is $F e S$ and Z is $F e_{3} O_{4}$

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