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Which of the following statements is correct for the spontaneous adsorption of a gas?

  1. A
    is negative and, therefore, should be highly positive.
  2. B
    is negative and, therefore, should be highly negative.
  3. C
    is positive and, therefore, should be negative.
  4. D
    is positive and, therefore, should also be highly positive.

Solution & Step-by-step Explanation

During the adsorption of a gas on a solid surface:Randomness of the gas molecules decreases, so is negative.For a spontaneous process, .Since is negative, is positive.For to be negative, must be negative and its magnitude must be greater than . Thus, adsorption is an exothermic process.

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Which of the following statements is correct for the spontaneous adsorption of a gas?
A
is negative and, therefore, should be highly positive.
B
is negative and, therefore, should be highly negative.
C
is positive and, therefore, should be negative.
D
is positive and, therefore, should also be highly positive.

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Surface ChemistryAdsorption

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