Which of the following is an adsorbent for removal of nitrogen oxides from gas/air?

Which of the following is an adsorbent for removal of nitrogen oxides from gas/air?

Q. Which of the following is an adsorbent for removal of nitrogen oxides from gas/air?

  1. Active carbon
  2. Silica gel
  3. Bog iron (iron oxide)
  4. Pulverised limestone

Answer: Silica gel

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