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The operating temperature range for the Haber process is $350-500^{\circ}C$. It is used for the production of ammonia at

  1. $20 \:MPa$ using $Fe$ catalyst in an exothermic reaction
  2. $0.1 \:MPa$ using $Fe$ catalyst in an exothermic reaction
  3. $20 \:MPa$ using $Fe$ catalyst in an endothermic reaction
  4. $20 \:MPa$ using zeolite catalyst in an endothermic reaction
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