Most Expected Questions of Chemical Science: Surface Chemistry! (Download PDF)

By Renuka Miglani|Updated : October 28th, 2021

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As we all know, the CSIR-NET exam is very near, and there is no time left for revision. At this point, you must be seeking some ready-made authentic short revision notes or some important questions to practice just before the exam. How will you react if you get all these study materials in one place? It will be beneficial for you at this time, right! At BYJU'S Exam Prep, we come up with the Most Important Questions of Surface Chemistry for Chemical Sciences to help you score good marks, which our experienced Exam experts have meticulously designed.

So what are you waiting for? Scroll down the article below and start studying for the CSIR NET Exam; these questions will be fruitful during last-minute revision to fetch more marks in the exams. Students can also download it as a PDF file and save it for future purposes.

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Hello Aspirants,

Surface Chemistry - Most Important Questions! (Download PDF)

1. In Freundlich Adsorption Isotherm, value of 1/n can be defined as -

1 in case of chemisorption
1 in case of physical Adsorption
Between o to 1 in all the cases
0 in all the cases

2. Adsorption is

An exothermic process hence increases in temperature decrease adsorption in case where Vander Waals forces exist between adsorbate and adsorbent.
An endothermic process hence increase in temperature increases adsorption.
An exothermic process hence increase in temperature increases adsorption.
None of the above.

3. A graph plotted log x/m vs log p shows a straight line with slope = 1 and intercept = 0.4771 . The extent of adsorption of gas at p= 2 atm is:

4. For 1.0 × 10-4 M aqueous solutions of n-butanoic acid at 25°C. By

using Gibb’s adsorption equation, determine the average surface area available to each molecule.

5.2 × 10^-19 m²
3.9 × 10^-19 m²
4.7 × 10^-19 m²
6.7 × 10^-19 m²

5.The adsorption of a gas on a solid surface follows a Langmuir isotherm with k = 3.76 kPa^-1, at a temperature of 25°C. Calculate the pressure of gas required to achieve a fractional surface coverage of 10^-1.

32 Pa
27 Pa
30 Pa
45 Pa

6. Which gas is adsorbed to maximum extent on the given surface?

NH₃
H₂
N₂
O₂

7. The time for which the oxygen atom remains adsorbed on a tungsten surface is 0.36 s at 2550 K and 3.49 s at 2360 K. Determine the activation of desorption of oxygen atoms.

432.42 kJ/mol
532.30 kJ/mol
326.43 kJ/mol
598.29 kJ/mol

8. The mass x of a solute adsorbed per gram of a solid adsorbed is given by the Freundlich adsorption isotherm as x = kcⁿ, here k and n are 0.160 and 0.431, respectively. Calculate the amount of acetic acid (M_m = 60.05 g mol-1) that 1 kg of charcoal would adsorb from a 0.837 M vinegar solution.

4.32 mol
2.47 mol
1.57 mol
3.26 mol

9. An organic fatty acid forms a surface film on water that obeys the two-dimensional ideal gas law. If the surface tension lowering is 10 mN m^-1 at 25^oC, calculate the surface excess concentration.

4.04×10^-5 mol m^-2
4.04×10^-6 mol m^-2
4.04×10^-4 mol m^-2
4.04×10^-3 mol m^-2

10.For adsorption process, the correct thermodynamic condition is:

∇ H must be negative
∇ S must be negative
∇ G must be negative
∇ H, ∇ S, ∇ G must be negative

Solutions

Solution 1:

Solution 2:

Adsorption is a Surface Phenomenon and an exothermic process hence increase in temperature decrease adsorption in case where Vander Walls’s forces exist between adsorbate and adsorbent.

Solution 3: