Why don’t alkali metals displace less active metals from solutions of their salts?

In the row of metal activity, each metal standing to the left can displace the metal located to the right from its salts. But alkali metals cannot displace less active metals from solutions of their salts, because they will react with water.
2 K + 2 H2O = 2 KOH + H2
2 Na + 2 H2O = 2 NaOH + H2



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