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Surface Chemistry · Question 26

AIPMT 2001MCQMedium📈 Topic in 12% papers+4−1
1

Which is not correct regarding the adsorption of a gas on surface of a solid?

  1. On increasing temperature adsorption increases continuously.
  2. Enthalpy and entropy change is negative.
  3. Adsorption is more for some specific substance.
  4. It is a reversible reaction.

Answer

(1) On increasing temperature adsorption increases continuously.

Solution

As per NCERT, adsorption is always exothermic ( H < 0) and the gas loses freedom of movement on the surface ( S < 0), so (2) is correct.

⇒ Chemisorption is highly specific and physisorption is reversible, so (3) and (4) are correct.

⇒ Physisorption decreases with increase in temperature (Le Chatelier's principle), while chemisorption first increases and then decreases.

∴ Adsorption does not increase continuously with temperature.

Answer: (1)

Out of syllabusAIPMT 2001

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2

Which one of the following methods is commonly used for the destruction of a colloid?

  1. Dialysis
  2. Condensation
  3. Filtration by animal membrane
  4. By adding electrolyte
Out of syllabusAIPMT 2000

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