All the alkali metals react with water to produce elementary hydrogen and the corresponding alkali hydroxides. The reactivity increases with increasing periodic number The reactions
2 Na + 2 H2O ----> 2 NaOH + H2
2 K + 2 H2O ----> 2 KOH + H2
2 Na + 2 H2O ----> 2 NaOH + H2
2 K + 2 H2O ----> 2 KOH + H2




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