Give balanced equations for obtaining hydrogen from :
(a) Boiling water using a divalent metal
(b) Steam using a trivalent metal
(c) Steam using a metal - and the reaction is reversible.

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Solution

To obtain $H_{2}$ using boiling water and
(a) A divalent metal $M g$
$M g + H_{2} O ⟶ M g O + H_{2}$
(b) Steam and trivalent metal $A l$
$2 A l + 3 H_{2} O ⟶ A l_{2} O_{3} + 3 H_{2}$
(c) Steam and a metal- a reaction is reversible
$3 F e + 4 H_{2} O ⇌ F e_{3} O_{4} + 4 H_{2}$

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