Which of the following releases hydrogen from cold water?
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Potassium, Sodium and Calcium react with cold water to produce hydrogen gas.
Reaction with Potassium—2K(s)+ 2H2O(l) → 2KOH(aq) + H2(g)
Reaction with Sodium—Na(s)+H2O(l) → NaOH(aq) +H2(g)
Reaction with Calcium—Ca(s)+2H2O(l)→Ca(OH)2(aq)+H2(g)
All reactions are exothermic reactions, Potassium and Sodium react more vigorously while Calcium reacts less vigorously.
Reaction with Potassium—2K(s)+ 2H2O(l) → 2KOH(aq) + H2(g)
Reaction with Sodium—Na(s)+H2O(l) → NaOH(aq) +H2(g)
Reaction with Calcium—Ca(s)+2H2O(l)→Ca(OH)2(aq)+H2(g)
All reactions are exothermic reactions, Potassium and Sodium react more vigorously while Calcium reacts less vigorously.
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