MHT CET Medical202624 April 2026Evening ShiftChemistryHydrogenActual
Which of the following statements is NOT true regarding dihydrogen?
Options
- AIt reduces oxides and ions of metal, having more reactivity than iron.
- BIt inflames with fluorine at -250 ^ C in dark
- CIt is used for preparation of methanol.
- DIt reacts with alkali metals to form metal hydrides.
Correct answer
A. It reduces oxides and ions of metal, having more reactivity than iron.
Step-by-step solution
Dihydrogen reduces oxides and ions of metals that are less reactive than iron, not more reactive. For example, it reduces copper(II) oxide to copper, but cannot reduce aluminium oxide or magnesium oxide. Dihydrogen reacts violently with fluorine even in the dark at very low temperatures ( -250 ^ C ). It is used in the industrial preparation of methanol from carbon monoxide: CO + 2H₂ catalyst CH₃OH . It reacts with highly electropositive alkali metals at high temperatures to form ionic metal hydrides. Answer: It red