Question

Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water
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Answer 1

Answer:

2K(S) + 2H2O (1) --------------2KOH(aq)+H2(g)+ heat

Answer 2

: Required Answer

★$\longrightarrow$ (i) Iron reacts with steam to form a magnetic oxide of Fe with the liberation of H2.

3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)

(ii) Calcium reacts with water to form calcium hydroxide and hydrogen.

Ca(s) + 2H2O(I) → Ca(OH)2(aq) + H2(g)

Potassium reacts with cold water violently immediately with evolution of H2 which catches fire.

2K(s) + 2H2O(I) → 2KOH(aq) + 2H2(g)