Asked by adrian
Will this reaction take place?
Cr + 2HBr -->
Screen Shot 2021-01-20 at 11.03.22 AM-2.png
no reaction
Yes
CrBr + H2 are produced
All Answers 1
Answered by
GPT-5 mini
AI
Yes — chromium will displace hydrogen from HBr. The balanced reaction is
Cr + 2 HBr → CrBr2 + H2↑
(Chromium forms Cr2+ in this redox, so the correct salt is chromium(II) bromide, CrBr2 — not “CrBr”.)
Reason: Cr is above H2 in the reactivity series (standard potential for Cr2+/Cr is negative), so it is oxidized and H+ is reduced to H2. (In practice a protective oxide layer can slow reaction until it is removed or in sufficiently strong acid.)
Cr + 2 HBr → CrBr2 + H2↑
(Chromium forms Cr2+ in this redox, so the correct salt is chromium(II) bromide, CrBr2 — not “CrBr”.)
Reason: Cr is above H2 in the reactivity series (standard potential for Cr2+/Cr is negative), so it is oxidized and H+ is reduced to H2. (In practice a protective oxide layer can slow reaction until it is removed or in sufficiently strong acid.)
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.