railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Equilibrium

Which of the following methods can't be used for the preparation of hydrogen gas?  

1
Steam reformer process
2
Reaction of saltlike hydrides with water
3
Electrolysis of the aqueous solution of NaOH or KOH
4
Reaction of ethanolamine solution with CO2
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