1. H₂ + Cl₂ ⇋ 2HCl
  2. N₂ + O₂ ⇋ 2NO
  3. N₂O₄ ⇋ 2 NO₂
  4. H₂ + I₂ ⇋ 2HI
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1 Answers

Answer: Option 2

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