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JEE Main levelSingle correct optionDifficulty 2 of 3sc021

Which of the following is an example of chemisorption?

  1. A on activated charcoal at room temperature
  2. BNitrogen on iron at
  3. CArgon on charcoal at
  4. DHydrogen on finely divided nickel

Answer: D

Hydrogen forms Ni-H bonds on nickel, so it is chemisorbed. Nitrogen on iron at is physisorption (chemisorption occurs only at about ), and argon or on charcoal are physisorbed.
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