Which one of the following statements about dihydrogen (H2) is not correct?

Dihydrogen (H2) is a colorless, odorless gas that is significantly lighter than air and exhibits very low solubility in water [4]. It is relatively inert at room temperature because the H-H bond has the highest dissociation enthalpy for any single bond between two atoms, requiring high temperatures or catalysts to react. At elevated temperatures, dihydrogen reacts with alkali metals to form crystalline ionic (saline) hydrides [3]. Statement 4 is incorrect because Syngas, or synthesis gas, is defined as a mixture of hydrogen (H2) and carbon monoxide (CO), not nitrogen dioxide (NO2). Syngas is typically produced from the gasification of carbonaceous materials like coal, natural gas, or biomass.

Sources

1. [2] https://pubchem.ncbi.nlm.nih.gov/compound/Hydrogen
2. [4] https://docs.nrel.gov/docs/fy04osti/34929.pdf
3. [3] https://www.sciencedirect.com/science/article/abs/pii/S0360319907000432