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COMEDK2021ChemistrySurface Chemistry

Which of the following conditions are favourable for chemisorption?

Options

  1. ALow temperature and high pressure
  2. BHigh temperature and low pressure
  3. CHigh temperature and high pressure
  4. DLow temperature and low pressure

Correct answer

C. High temperature and high pressure

Step-by-step solution

Chemisorption involves formation of strong chemical bonds between adsorbate and adsorbent. Temperature: Since bond formation requires activation energy, high temperature provides the necessary energy to overcome the activation energy barrier. Hence high temperature is favourable. Pressure: High pressure increases collision frequency of gas molecules with the surface, leading to greater extent of adsorption. Hence high pressure is favourable. Favourable conditions for chemisorption: high temperature and high pressur

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