Physical Chemistry-Colloids and Surfaces [CSIR (Council of Scientific & Industrial Research) Chemical Sciences]: Questions 1 - 4 of 4

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Question 1

Appeared in Year: 2014

Question MCQ▾

For non-dissociative Langmuir type adsorption of a gas on a solid surface at a particular temperature, fraction of surface coverage is 0.6 at 30 bar. Langmuir isotherm constant (in ) at this temperature is (June)

Choices

Choice (4)Response

a.

0.05

b.

0.02

c.

2.0

d.

5.0

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Question 2

Appeared in Year: 2020

Question MCQ▾

The correct statement about chemisorption is

Choices

Choice (4)Response

a.

Chemisorption results in multi molecular layer adsorption.

b.

Chemisorption has lower specificity than physisorption.

c.

Chemisorption is reversible in nature.

d.

Chemisorption occurs due to formation of chemical bonds.

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Question 3

Appeared in Year: 2022

Question MCQ▾

Liquid has half the surface tension and twice the density of liquid at . The contact angles of and are the same. If rises in a capillary then the rise (in ) of liquid in the same capillary at the same temperature will be equal to (February)

Choices

Choice (4)Response

a.

20

b.

40

c.

10

d.

60

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Question 4

Appeared in Year: 2022

Question MCQ▾

The surface tension of a dilute soap solution is lower than that of pure water because (February)

Choices

Choice (4)Response

a.

Soap molecules accumulate more at the surface than in the bulk solution

b.

Soap molecules accumulate more in the bulk of the solution than on the surface

c.

Soap molecules form micellar structures at low concentration.

d.

The soap molecules aggregate uniformly in the bulk and the surface.

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