Name one metal that reacts very slowly with boiling water and liberates the hydrogen.

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Solution

The alkaline earth metals react with the water to form the hydroxides. The hydroxides of calcium, strontium, and barium are slightly soluble in water. The general reaction for the hydroxides of alkaline earth metal is as shown below
$M + 2 H_{2} O \to M {(OH)}_{2} + H_{2}$
Due to intermediate values for the reduction potential, the magnesium does not react with the cold water. But it does react with hot water. The reaction of magnesium with the hot water is as shown below:
$Mg + 2 H_{2} O \to Mg {(OH)}_{2} + H_{2}$
That is, Magnesium (Mg) reacts with hot water to form magnesium hydroxide and hydrogen gas.

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