The highest industrial consumption of molecular hydrogen is to produce compounds of element :

Solution

Chemistry ma’am · 3 steps

Think of the Haber process: most industrial hydrogen ends up in ammonia, a nitrogen compound.

1. Biggest single use. The largest single use of dihydrogen is making ammonia by the Haber process: N₂ + 3H₂ ⇌ 2NH₃. This uses roughly half of all hydrogen produced in industry.

   Industrial use of H₂	Product	Element whose compound forms	Scale
   Haber process	NH₃, then HNO₃ and fertilisers	Nitrogen	largest
   Methanol synthesis, hydrogenation of oils	CH₃OH, vanaspati ghee	Carbon	smaller
   Burning with chlorine	HCl	Chlorine	smaller
   Rocket fuel, fuel cells	H₂O	Oxygen	small

2. Why ammonia wins. Ammonia feeds the huge fertiliser industry (urea, ammonium salts) and the manufacture of nitric acid. No other use of hydrogen comes close in volume.
3. So. Most industrial hydrogen goes into compounds of nitrogen, option (b).

The idea to keep. For uses of dihydrogen, remember the order: ammonia (Haber process) first by far, then methanol and hydrogenation of oils, then HCl and fuels.

Answer from the NTA final answer key. Solution by PrepWiser.