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

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Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water
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(a) `3Fe(s) + 4H_(2)O ("steam") rarr .^(**)Fe_(3)O_(4)(s) + 4H_(2)(g)`
(b) `Ca(s) + 2H_(2)O(aq) rarr Ca(OH)_(2)(s) + H_(2)(g)`
(c ) `2K(s) + 2H_(2)O(aq) rarr 2KOH(aq) + H_(2)(g)`
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