UPSC CAPF (AC) 2026 Paper I · Question 109

Question 109 of the UPSC CAPF (AC) 2026 Paper I (19 July 2026). Try it first, then open the answer and explanation.

1. CAPF 2026 · P-I · Q109 · General Science · Chemistry

   Which one of the following processes is not used for the production of hydrogen gas?

   1. Electrolytic process
   2. Water gas-steam process
   3. Liquefaction of coal gas
   4. Hydrolysis of calcium carbide

   निम्नलिखित में से किस प्रक्रम (process) का उपयोग हाइड्रोजन गैस के उत्पादन के लिए नहीं किया जाता है?

   1. विद्युत्-अपघटनी (electrolytic) प्रक्रम
   2. भाप-अंगार गैस-वाष्प प्रक्रम (water gas-steam process)
   3. कोयला गैस का द्रावण (liquefaction)
   4. कैल्सियम कार्बाइड का जल-अपघटन (hydrolysis)
   Show answer

   Answer: (4) Hydrolysis of calcium carbide

   उत्तर: (4) कैल्सियम कार्बाइड का जल-अपघटन (hydrolysis)

   Hydrolysis of calcium carbide (CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂) gives acetylene, not hydrogen. Hydrogen is made by electrolysis of water, by the water gas-steam (Bosch) process, and from coal gas by cooling it until the other constituents liquefy, leaving hydrogen gas.

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