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Answer:

2Cr(s) → 2Cr3+(aq) + 3e⁻

Explanation:

  • The complete half reaction is 2Cr(s) → 2Cr3+(aq) + 3e⁻
  • The half reaction shows an oxidation reaction.
  • Oxidation refers to the loss of electrons by an atom of an element.
  • In this case, chromium atom undergoes oxidation by losing three electrons to form chromium ion.
  • Additionally, the oxidation number has increased from 0 to +1 which makes it an oxidation reaction.

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