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MMLU-Pro / 4018 / At pH values of 4 to 9, natural amino acids exist as polar or zwitter ions:…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

At pH values of 4 to 9, natural amino acids exist as polar or zwitter ions: H_2N^+CHZCO^-_2. At a pH of 12, what would be the predominant ionic type? What would it be at a pH of 2? Can the uncharged molecular form, H_2NCHZCO_2 H ever predominate at any pH?

category

chemistry

options

  1. At pH = 12, H^+_3HCHZCO_2H predominates. At pH = 2, H_2NCHZCO_2H predominates. H_2NCHZCO_2^- can sometimes predominate.
  2. At pH = 12, H_2NCHZCO_2H predominates. At pH = 2, H^+_3HCHZCO_2H predominates. H_2NCHZCO_2^- can always predominate.
  3. At pH = 12, H^+_3HCHZCO_2H predominates. At pH = 2, H_2NCHZCO_2H predominates. H_2NCHZCO_2^- can never predominate.
  4. At pH = 12, H^+_3HCHZCO_2^- predominates. At pH = 2, H_2NCHZCO_2^- predominates. H_2NCHZCO_2H can always predominate.
  5. At pH = 12, H_2NCHZCO_2^- predominates. At pH = 2, H_2NCHZCO_2H predominates. H^+_3HCHZCO_2H can always predominate.
  6. At pH = 12, H_2NCHZCO_2^- predominates. At pH = 2, H^+_3HCHZCO_2H predominates. H_2NCHZCO_2H can never predominate.
  7. At pH = 12, H^+_3HCHZCO_2H predominates. At pH = 2, H_2NCHZCO_2^- predominates. H_2NCHZCO_2H can always predominate.
  8. At pH = 12, H_2NCHZCO_2H predominates. At pH = 2, H_2NCHZCO_2^- predominates. H^+_3HCHZCO_2H can never predominate.
  9. At pH = 12, H_2NCHZCO_2^- predominates. At pH = 2, H^+_3HCHZCO_2^- predominates. H_2NCHZCO_2H can sometimes predominate.
  10. At pH = 12, H_2NCHZCO_2^- predominates. At pH = 2, H_2NCHZCO_2^- predominates. H^+_3HCHZCO_2H can never predominate.

src

stemez-Chemistry

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Source and history

upstream_id / Original problem ID
4018
task_id
1fc008ce-3cef-57b4-b5f1-90e895cb7d70
task_key
default--test--4018
task_revision_id
1
config / split
default / test

Official source

initial import