Question

how is hydroge prepared from cold water without using electricity

Answer 1

The process splits water into hydrogen and oxygen using heat and catalysts made from inexpensive materials. Heat-driven water splitting is an alternative to electrolysis, which is expensive and requires large amounts of electricity.

Answer 2

Hydrogen can be prepared from cold water by reacting alkali metals like Sodium,Potassium and Calcium

Na + H₂O --> NaOH + H₂

Ca + H₂O --> Ca(OH)₂ +H₂

K + H₂O --> KOH + H₂