Write about the preparation of Hydrogen by the action of cold water, hot water, and steam on metals.

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Solution

Preparation of Hydrogen using Cold water: Active metals like Potassium $(K)$ , Sodium $(Na)$ , and Calcium $(Ca)$ react with cold water to liberate Hydrogen gas and form the corresponding metal hydroxide $(MOH)$ . (M= metal).
$2 K (s) + H_{2} O (l) \to 2 KOH (aq) + H_{2} (g) Potassium Cold Potassium Hydrogen water Hydroxide$
Preparation of Hydrogen using hot water: Magnesium liberates Hydrogen from boiling water, but the reaction is slow.
$Mg (g) + 2 H_{2} O (l) \to Mg {(OH)}_{2} (aq) + H_{2} (g) Magnesium Boiling Magnesium Hydrogen Water hydroxide$
Preparation of Hydrogen using steam: When steam is passed over heated metals like Magnesium $(Mg)$ , Zinc $(Zn)$ , Iron $(Fe)$ , and Aluminium $(Al)$ , liberates Hydrogen $(H_{2})$ gas and forms corresponding metal oxide $(MO)$ .
The reaction of steam with Magnesium: When steam is passed over heated Magnesium liberates Hydrogen gas and forms Magnesium oxide.
$Mg (g) + H_{2} O (g) \to MgO (s) + H_{2} (g) Magnesium Steam Magnesium Hydrogen oxide$

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