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 |
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. |
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 |
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. |