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  3. Chemistry
  4. The given graph/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

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Q. The given graph/data $I, II, III$ and $IV$ represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about $I, II, III$ and $IV$ is (are) correct?Chemistry Question Image

IIT JEEIIT JEE 2012Surface Chemistry

Solution:

Graph-I represents physisorption as in physisorption, absorbents are bonded to adsorbate through weak van der Waals' force.
Increasing temperature increases kinetic energy of adsorbed particles increasing the rate of desorption, hence amount of adsorption decreases.
Graph- III also represents physical adsorption as extent of adsorption increasing with pressure.
Graph-II represents chemisorption as it is simple activation energy diagram of a chemical energy diagram for the formation of a typical covalent bond.