CBSE Class 12 Chemistry Chapter 5 Competency-Based Questions With Answers 2024-25: Are you also a board student looking to prepare for the upcoming board exams? Well, don't worry as we always have your back. Students can look at the competency-based questions for Chapter 5 Surface Chemistry. These questions help the students to prepare for the exam effectively.
CBSE Class 12 Chemistry Chapter 5 Competency-Based Questions With Answer Key 2024-25
| Q. No | Question | Marks |
| Multiple Choice Questions | ||
| Q.108 | Which of the following is/are correct? (i) At high pressure and temperature, physisorption may change to chemisorption and the gas on a solid surface can’t be retrieved. (ii) The freezing point of the colloidal solution is lower than the true solution at the same concentration of a solute. A. only i B. only ii C. both i and ii D. all- i, ii, and iii | 1 |
| Q.109 | Which of the following is/are correct for Freundlich's adsorption isotherm? (i) The quantity of adsorbed particles on the adsorbent is directly proportional to k (ii) the quantity of adsorbed particles on the adsorbent can be independent of p (iii) the quantity of adsorbed particles on the adsorbent is directly proportional to 1/n A. ii only B. ii and iii only C. i and iii only D. all- i, ii, and iii | 1 |
| Q.110 | The graph below shows the variation in the "quantity" of "gas adsorbed" with pressure as per the Freundlich adsorption isotherm.
Based on this graph, which of the following is directly proportional to x/m? | 1 |
| A. p B. √p C. p2 D. p4.5 | ||
| Q.111 | Which of the following is correct for the adsorption of methane on coal? A. ΔH >0; ΔS > 0 B. ΔH >0; ΔS < 0 C. ΔH < 0; ΔS < 0 D. ΔH < 0; ΔS > 0 | 1 |
| Q.112 | Look at the given information. The surface area of charcoal: 4.73 m2/g Surface area of activated charcoal: 950 m2/g Which of the following is TRUE about their adsorption capacity for nitrogen gas if 100 g of both the substances are taken at 273 K and 2 atm? A. Adsorption capacity of activated charcoal > adsorption capacity of charcoal B. Adsorption capacity of activated charcoal < adsorption capacity of charcoal C. Adsorption capacity of activated charcoal = adsorption capacity of charcoal D. Adsorption capacity can't be compared with the given information | 1 |
| Q.113 | Which of the following is/are correct? (i) In an enzyme-catalysed reaction, the enzyme reacts completely with the substrate and is consumed by the substrate to form products (ii) Dispersed particles with a wavelength of 10 nm can show the Tyndall effect in the presence of light with the frequency of 3 x 10-16 Hz (iii) The smoke coming out of the chimney to a Cottrell smoke precipitator is always charged (either positively or negatively) A. i only B. ii only C. ii and iii only D. all- i, ii, iii | 1 |
| Q.114 | Which of the following statements is/are correct? | 1 |
| (i) Rusting of iron is an example of physical adsorption. (ii) In the case of chemical adsorption, energy is released. (iii) The degree of adsorption for different gases by the same adsorbent is always the same. A. i only B. ii only C. ii and iii only D. all- i, ii, and iii | ||||||||
| Q.115 | Which of the following is/are example(s) of the Tyndall effect? (i) the blue colour of the sky (ii) formation of deltas (iii) coagulation (iv) visibility of a comet's tail A. i only B. i and iv only C. iii and iv only D. all- i, ii, iii, and iv | 1 | ||||||
| Free Response Question/Subjective Type | ||||||||
| Q.116 | (i) The table below shows the volumes of nitrogen adsorbed by a sample of 3g of activated charcoal at 0°C:
Evaluate the constants k and n if the above data fits Freundlich's adsorption isotherm. (ii) Draw the adsorption vs temperature curve for the above case at p= 180 mm. | 3 | ||||||
| Q.117 | (i) Draw a graph between the quantity of gas adsorbed vs temperature at constant pressure for physical adsorption. (ii) Explain the reason behind the variation in the quantity of gas adsorbed with temperature. | 3 | ||||||
To get the rest of the sample paper with the answer key, we are providing the PDF below. Students can download the sample paper for free directly from the link provided.
CHECK: CBSE Class 12 Chemistry Chapter-5 Competency-Based Questions With Answer Key
CBSE Class 12 Chemistry Chapter-5 Competency Based Questions Answer Key
| Q.No | Answers | Marks |
| Q.108 | C. both i and ii | 1 |
| Q.109 | A. ii only | 1 |
| Q.110 | B. √p | 1 |
| Q.111 | C. ΔH < 0; ΔS < 0 | 1 |
| Q.112 | A. Adsorption capacity of activated charcoal > adsorption capacity of charcoal | 1 |
| Q.113 | B. ii only | 1 |
| Q.114 | B. ii only | 1 |
| Q.115 | B. i and iv only | 1 |
| Q.116 | (i) Evaluate the constants k and n: - As per Freundlich's adsorption isotherm, x1/x2 = (p1/p2)1/n - So log (16.5/38.1) = (1/n) log (180/540) - Solving for n gives 1.31 [1 mark] - Since x/m = k p1/n - So, 16.5/3 = k (180)1/1.31 - Solving for k gives 0.104 [1 mark] Since the adsorption of nitrogen on charcoal is an example of physical adsorption, the curve will be
| 3 |
| Q.117 | (i) Curve for physical adsorption: | 3 |
To get the rest of the answers, students can take a look at the link below:
CHECK: CBSE Class 12 Chemistry Chapter-5 Competency-Based Questions With Answer Key
Now, that the students have got the questions with the answer key, they can start preparing for the exam.
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