Which metal reacts with cold water violently?

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Question

(C) The reactivity of metals with water depends on their position in the reactivity series. Alkali metals like $Potassium$ $(K)$ and $Sodium$ $(Na)$ a

Vedclass · Accepted Answer

Potassium

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(C) The reactivity of metals with water depends on their position in the reactivity series. Alkali metals like $Potassium$ $(K)$ and $Sodium$ $(Na)$ are highly reactive. $Potassium$ reacts violently with cold water to form $Potassium$ hydroxide $(KOH)$ and hydrogen gas $(H_2)$, releasing a large amount of heat which causes the hydrogen to catch fire immediately. The reaction is: $2K(s) + 2H_2O(l) ightarrow 2KOH(aq) + H_2(g) + 	ext{Heat}$.

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