CBSE Class 12 Chemistry Chapter 2 Competency-Based Questions With Answer Key 2024-25: The Central Board of Secondary Education has made available the latest competency-based questions for board class 12 on its official website. This article will help the students to get CBSE Class 12 Chemistry Chapter 2 Solutions competency-based questions with the answer key. They can look at these practice questions that will help them to learn about the type of questions that can be asked for the exam along with the total weightage. Keep reading the article to know.
CBSE Class 12 Chemistry Chapter 2 Competency-Based Questions With Answer Key 2024-25
| Q.No | Question | Marks |
| Multiple Choice Question | ||
| Q.21 | In a chemistry laboratory, Richa took 5g of a solute from an unknown box and prepared a 0.25 M basic solution. The volume of the solution was 500 ml. Based on the above data, which of the following is likely to be the unknown substance used by Richa? (Approx. Atomic masses of Ca = 40 u; Na = 23 u; Li = 7 u; Cs = 133 u; O = 16 u; H = 1 u) A. Ca(OH)2 B. NaOH C. LiOH D. CsOH | 1 |
| Q.22 | A glycerine solution, at 293 K, has a molality of 3.89 molal and a molarity of 5.33 M. Which of these would be CORRECT for the molarity and molality of the same glycerine solution at 450K? A. Molarity < 5.33 M; Molality = 3.89 molal B. Molarity < 5.33 M; Molality < 3.89 molal C. Molarity > 5.33 M; Molality = 3.89 molal D. Molarity = 5.33 M; Molality = 3.89 molal | 1 |
| Q.23 | A mixture of acetone and chloroform forms a maximum boiling azeotrope at a specific composition. Which of these is CORRECT for the mixture? A. Change in volume on mixing will be positive. B. Change in enthalpy on mixing will be positive. C. Interaction between unlike molecules is stronger than that between like molecules in the mixture. D. The proportion of acetone and chloroform in the mixture in the liquid phase is not the same as in the vapour phase. | 1 |
| Q.24 | In a chemistry laboratory, a student has 0.01 L of 10-2 mol dm-3 sulphuric acid solution. The lab assistant asked the students to reduce their concentration to 2 x 10-4 mol dm-3 by adding water into it. What should be the volume of the water added? A. 200 ml B. 490 ml C. 500 ml D. 510 ml | 1 |
| Q.25 | As per Henry's law KH= p/x; where p is the partial pressure, x is the mole fraction of the gas, and KH is the Henry law constant. If, the concentration of N2 gas in water at constant pressure increases quadratically, how will the value of KH change? A. Increases linearly B. Decreases quadratically C. Decreases linearly D. Remains the same | 1 |
| Q.26 | 342.3 g of sucrose is dissolved in 1 kg of water in a pot to form a solution. The boiling point of water (solvent) is 373.15 K. Which of the following is likely to be the boiling point of the solution? (Molar mass of sucrose= 342.3 g/mol; Atmospheric pressure= 1.013 bar; KH= 0.52 K kg mol-1) A. 373 K B. 373.15 K C. 373.67 K D. 372.63 K | 1 |
| Q.27 | The molarity of a solution of NaOH in water is '5p' during the winter season (Temperature = 275K). Which of the following could be the molarity of the same solution in terms of p during the warm days in summer (Temperature = 325K)? | 1 |
| [Note: p is an integer] A. 5p + 50 B. 5p C. 4.95p D. 250p | ||
| Q.28 | Which of the following statements is/are true: (i) The freezing point of 0.1M KCl is higher than that of 0.1M C2H5OH. (ii) The freezing point of a 4% aqueous solution of X having molecular weight as “m” is equal to the freezing point of a 12% aqueous solution of Y having molecular weight “3m” (assume that i=1 for both X and Y) (iii) The boiling point of pure water at sea level is greater than that at Mt. Everest. A. i and ii B. i, ii, and iii C. ii and iii D. i and iii | 1 |
| Q.29 | Which of the following statements is/are correct? (i) Sea water boils at a lower temperature than fresh water. (ii) ΔS is higher for the vaporization of pure solvent than the vaporization of solvent from a solution containing a non-volatile electrolytic solute. (iii) The boiling point of water is lower than that of glucose water. A. i and iii B. ii and iii C. i, ii, and iii D. i only | 1 |
| Q.30 | Which of the following should be done to change 100 ml of 0.1M KCl solution to 0.2M? (i) Reduce the volume of solution to half by evaporation (ii) Add 50 ml water (iii) Add 0.1 mol KCl (iv) Add 0.01 mol KCl A. i and iii B. i and iv C. ii and iv D. Any of i, ii, iii, and iv | 1 |
CBSE Class 12 Chapter 2 Competency-Based Questions Answer Key 2024-25
| Q.No | Answers | Marks |
| Q.21 | B. NaOH | 1 |
| Q.22 | A. Molarity < 5.33 M; Molality = 3.89 molal | 1 |
| Q.23 | C. Interaction between unlike molecules is stronger than that between like molecules in the mixture. | 1 |
| Q.24 | B. 490 ml | 1 |
| Q.25 | D. remains the same | 1 |
| Q.26 | C. 373.67 K | 1 |
| Q.27 | C. 4.95p | 1 |
| Q.28 | C. ii and iii | 1 |
| Q.29 | B. ii and iii | 1 |
| Q.30 | B. i and iv | 1 |
These were the first 10 questions and answers to the competency-based questions. To get full access to other questions as well, we are providing a free PDF for the students so that they can download the file easily.
CHECK: CBSE Class 12 Chapter 2 Solutions Competency-Based Questions With Answer Key 2024-25
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