JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Surface Chemistry

WhatsApp Email

Identify the correct molecular picture showing what happens at the critical micellar concentration (CMC) of an aqueous solution of a surfactant
(● polar head; ▬ non-polar tail ; · water).

(A)(B)
(B)(A)
(C)(C)
(D)(D)✓ Correct

Answer: (D)

Solution

At the critical micelle concentration the surfactant molecules first gather into micelles. In water the non-polar tails cluster together in the interior, shielded from the solvent, while the polar heads point outward into the water, which minimises the free energy of the system. The picture showing tails drawn inward and polar heads facing the surrounding water is the correct one.

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Surface Chemistry →

More JEE Main questions on Surface Chemistry

The adsorbent used in adsorption chromatography is/are
A. silica gel
B. alumina
C. quick lime
D. magnesia

Choose the most appropriate answer from the options given below :
JEE Main 2024View solution →
Identity the incorrect pair from the following:
JEE Main 2024View solution →
For the adsorption of hydrogen on platinum, the activation energy is $30 kJ mol^{- 1}$ and for the adsorption of hydrogen on nickel, the activation energy is $41.4 kJ mol^{- 1}$ . The logarithm of the ratio of the rates of chemisorption on equ …
JEE Main 2023View solution →
The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is ____

Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather.
JEE Main 2023View solution →
Coagulating value of electrolytes $AlCl_{3}$ and NaCl for $As_{2} S_{3}$ are 0.09 and 50.04 respectively. The coagulating power of $AlCl_{3}$ is $x$ times the coagulating power of NaCl . The value of $x$ is
____ :
JEE Main 2023View solution →
Ferric chloride is applied to stop bleeding because:
JEE Main 2023View solution →