Preparation of Dihydrogen — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Preparation of Dihydrogen.

Reagents and Conditions for Lab Preparation

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NEET frequently tests the basic knowledge of laboratory preparations. Questions might involve identifying the correct metal-acid/base combination, or explaining why certain combinations are unsuitable (e.g., Na with water, Cu with dilute HCl, metals with $HNO_3$). Students need to recall specific reactions and their safety/efficiency implications. This is a fundamental concept that forms the base of understanding hydrogen chemistry.

Industrial Processes: Steam Reforming & Water-Gas Shift

high

These are the most economically significant methods. Questions will likely focus on the overall reaction, specific catalysts (Ni, $Fe_2O_3/Cr_2O_3$), optimal temperature/pressure, the composition of 'water gas' or 'syngas', and the purpose of the water-gas shift reaction (CO conversion, $H_2$ yield increase). Understanding the sequence of steps and the role of each component is crucial for these questions.

Electrolysis and By-products

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Electrolysis of water and brine are important industrial methods. Questions could ask about the purity of hydrogen obtained, the co-products (oxygen from water, chlorine and NaOH from brine), and the energy requirements. Understanding the electrochemical reactions at anode and cathode could also be tested. This angle combines knowledge of hydrogen preparation with basic electrochemistry.

Comparison of Methods and Purity

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Questions might ask students to compare different methods based on factors like purity of hydrogen produced, cost-effectiveness, or suitability for large-scale vs. small-scale production. For example, which method yields the purest hydrogen (electrolysis) or which is most economical (steam reforming). This requires a holistic understanding of all preparation methods.