Students often confuse the conditions (catalysts, temperature) for steam reforming and water-gas shift reaction.
Don't confuse the purity of hydrogen obtained; electrolysis generally gives the highest purity.
Forgetting that amphoteric metals like Zn, Al react with both acids and strong bases to produce hydrogen.
Rapid Revision
Hydrogen is prepared in the lab using active metals (Zn) with dilute acids or alkalis. Industrially, electrolysis of water, steam reforming of hydrocarbons (Bosch process), and the water-gas shift reaction are key. Remember specific catalysts and temperatures for industrial methods.
Frequently Asked Questions
What is the most common laboratory method for preparing hydrogen?▾
The most common laboratory method involves the reaction of granular zinc with dilute hydrochloric acid or dilute sulfuric acid. This reaction is easy to perform and produces hydrogen gas rapidly and safely.
Which industrial method yields the highest purity hydrogen?▾
Electrolysis of acidified water produces hydrogen of the highest purity (typically > 99.9%). This method is widely used when very pure hydrogen is required for specific applications like fuel cells or in the electronics industry.
What is the purpose of the water-gas shift reaction in industrial hydrogen production?▾
The water-gas shift reaction is used to convert carbon monoxide (CO), a component of syngas (water gas), into carbon dioxide (CO₂) and additional hydrogen (H₂). This process increases the overall yield of hydrogen and also helps in removing toxic CO from the gas mixture.
Practice MCQs on this topic
Interactive questions with instant AI explanations