Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water

Question

Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water

Accepted Answer

(i) Iron reacts with steam to form a magnetic oxide of Fe with the liberation of H2.
3Fe(s) + 4H2O(g) &rarr; Fe3O4(s) + 4H2(g)
(ii) Calcium reacts with water to form calcium hydroxide and hydrogen.
Ca(s) + 2H2O(I) &rarr; Ca(OH)2(aq) + H2(g)
Potassium reacts with cold water violently immediately with evolution of H2 which catches fire.
2K(s) + 2H2O(I) &rarr; 2KOH(aq) + 2H2(g)

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