How hydrogen is prepared by using hot water? Write a balanced chemical equation.

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Solution

Hydrogen is prepared by using hot water by reacting hot water with metals like Magnesium and zinc.
Magnesium and Zinc do not react with cold water but react rapidly with hot boiling water forming their respective oxide and hydrogen. $Mg + 2 H_{2} O (Hot water) \to Mg {(OH)}_{2} + H_{2}$
$Zn + 2 H_{2} O (Hot water) \to Zn {(OH)}_{2} + H_{2}$

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