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Surface Chemistry · Question 25

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

Position of non-polar and polar part in micelle

  1. polar at outer surface but non-polar at inner surface
  2. polar at inner surface but non-polar at outer surface
  3. distributed over all the surface
  4. are present in the surface only

Answer

(1) polar at outer surface but non-polar at inner surface

Solution

A soap/detergent ion has a polar (ionic) head, e.g. -COO-, and a long non-polar hydrocarbon tail.

As per NCERT, in a micelle the hydrocarbon tails point towards the centre (away from water) while the polar ionic heads lie on the surface in contact with water.

∴ Polar part is at the outer surface and non-polar part is at the inner surface.

Answer: (1)

Out of syllabusAIPMT 2002

Keep practising — Surface Chemistry

2

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.
Out of syllabusAIPMT 2001
3

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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