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Question #44750
The Question
Two electrolytic cells, X and Y, are connected in series. Cell X contains of in dilute , and Cell Y contains an aqueous solution of . A constant current is passed through the cells until of is deposited at the cathode of Cell Y. The electrolysis is then stopped. The resulting solution from Cell X is completely titrated with solution. What is the volume of solution required to reach the equivalence point?\n\n(Given: Atomic mass of , , , )
Options
- A.
1000 mL
- B.
1375 mL
- C.
1250 mL
- D.
500 mL
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Numerical_Precision
Improve calculation stamina and avoid rounding errors in high-stakes competitive examinations.
Concepts Behind This Question
Faraday's First and Second Laws|Variable Oxidation State Stability
Why This Question Is Tricky
Common Mistakes
The core trap tests the student's understanding of preferential discharge and variable oxidation states in electrochemistry.
Students often mechanically apply Faraday's First Law assuming metal deposition (), leading to an incorrect n-factor of 4.
However, in aqueous acidic media, the reduction of stops at due to its extreme stability and highly negative standard reduction potential to the metallic state.
Recognizing that the n-factor is 1 for the electrolytic reduction of to is the 'Hidden Variable' required to correctly determine the remaining concentration for the subsequent redox titration.
Quick Facts About This Question
Question Information
| Subject | Chemistry |
| Chapter | Electrochemistry - Class 12 |
| Concept | Faraday's First and Second Laws |
| Difficulty | 8 |
| Cognitive Load | 7 |
| Target Solve Time | 160 sec |
| Access | Free |