Question

a metal which produces hydrogen with cold water

Answer 1

Sodium reacts less strongly than potassium, for example. Reaction with cold water. All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced.

Answer 2

Potassium is a soft, silver-white metal that reacts violently with water to form hydrogen and potassium hydroxide. The heat of this reaction ignites the hydrogen, producing a vigorous bluish-pink flame. Like sodiummetal, potassium metal
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