Answer:
(i)
3Fe(s) + 4H2O(g) Fes3O4(s)+
4H2(g)
(ii) Ca(s)
+2H2O(l)Ca(OH)2(aq)
+ H2(g)
2K(s)
+ 2H2O(l)2KOH(aq) + H2(g)
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