CBSE Class 12 Chemistry Chapter 3 Competency-Based Questions With Answers 2024-25: Assessment is important in education as it reinforces the knowledge that the students gain throughout the course. These questions are designed to evaluate how well the students understand a particular subject or topic.
For the academic year 2024-25, CBSE has released competency-based questions with the answer key that can help the students to prepare well for the exam. Students who want to excel in their exams can take a look at these questions for better preparation.
In this article, we will be providing you with the competency-based questions for Class 12 Chemistry Chapter 3 Electrochemistry.
CBSE Class 12 Chemistry Chapter 3 Competency-Based Questions With Answer Key 2024-25
| Q.No | Question | Marks |
| Multiple Choice Question | ||
| Q.49 | If the standard emf of Galvanic cell−I: Cu (s)/Cu2+ aq)II Ag+ q)/Ag(s) is 0.46V, and the ( (a standard emf of Galvanic cell–II: 3 Cu(s) + 6 Ag+(aq) → 3Cu2+(aq) + 6 Ag (s) is 0.46q V. What is the value of q? A. 3 B. 2 C. 1 D. Infinite | 1 |
| Q.50 | The electrochemical cell made up of Zn and Cu half-cell is the ed Daniell cell. The emf of a Daniell cell is 1.10V. When an external voltage greater than 1.10 V is applied to this cell, which of the following changes will be observed in the cell? A. Zn electrode will act as an anode. B. Current will flow from Cu half cell to Zn half cell. C. Electrochemicals continue to work fast. D. Cells will act as electrolytic cells. | 1 |
| Q.51 | An electrolytic cell has an anode and cathode made up of graphite. At the anode, Cl2 gas is released and at the cathode, H2 gas is released. Which of the following electrolytes in the cell can produce these gases? A. NH4Cl (aq) | 1 |
| B. Molten NH4Cl C. NaCl (aq) D. Molten NaCl | ||
| Q.52 | There are two beakers 'A' and 'B' containing KCl and CH3COOH solutions respectively. On adding water to beakers A and B, which of the following changes in Λm of the solutions will be correct? A. It increases sharply in beaker A and slowly in beaker B B. It increases slowly in beaker A and sharply in beaker B C. It decreases in beaker A but no change in beaker B. D. There is no change in beaker A but it decreases slowly in beaker B. | 1 |
| Q.53 | Copper metal is purified by electrolytic refining. If the electrolyte used for refining copper in an electrolytic cell is aq. Salt solution of copper, which out of the following statement about this cell is INCORRECT? A. The impure Copper rod undergoes oxidation. B. Oxidation takes place at the anode. C. Impure copper rod acts as the negative electrode. D. Pure copper rod acts as a cathode. | 1 |
| Q.54 | Given that the standard reduction potential for Fe3+/Fe2+= 0.77 V and I2/I−= 0.54V. Which of the following is correct when the cell is made by using Fe3+ and I-salt solutions? A. The standard emf of the cell is −0.23 V B. The standard emf of the cell is +0.23 V C. The standard emf of the cell is 1.31 V D. The standard emf of the cell is -1.31 V | 1 |
| Q.55 | Under which of the following conditions will the chemical reaction in an electrochemical cell will be spontaneous? A. E0 = +ve, ΔG= +ve cell B. E0 = −ve, Δ G= −ve cell C. E0 = +ve, Δ G= −ve cell D. E0 = −ve, ΔG= +ve cell | 1 |
CBSE Class 12 Chemistry Chapter 3 Competency-Based Questions Answer Key 2024-25
| Q.No | Answers | Marks |
| Q.49 | C. 1 | 1 |
| Q.50 | D. Cells will act as electrolytic cells. | 1 |
| Q.51 | C. NaCl (aq) | 1 |
| Q.52 | B. It increases slowly in beaker A and sharply in beaker B | 1 |
| Q.53 | C. Impure copper rod acts as the negative electrode. | 1 |
| Q.54 | B. The standard emf of the cell is +0.23 V | 1 |
| Q.55 | C. E0 = +ve, Δ G= −ve cell | 1 |
To get the rest of the questions and answers, we are also providing a free PDF for the students to take a look at the rest of the competency-based questions.
CHECK: CBSE Class 12 Chapter 3 Competency-Based Questions With Answer Key 2024-25
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