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Question #44120
The Question
An acidified aqueous solution of reacts with in the presence of diethyl ether at to yield a deep blue colored compound , which is extracted into the organic layer. Consider two other compounds: is sodium tetrathionate () and is tribromooctaoxide (). Let be the actual oxidation state of the central metal atom in , be the number of peroxy linkages () present in one molecule of , be the magnitude of the difference between the highest and lowest formal oxidation states of the sulfur atoms in , and be the average oxidation state of the bromine atoms in . Evaluate the expression: .
Options
- A.
21
- B.
28
- C.
33
- D.
41
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Exception_Exposure
Learn to identify edge cases and boundary exceptions that JEE examiners hide in math problems.
Concepts Behind This Question
Stock Notation Logic|Average vs. Actual Oxidation State|Peroxy Linkage Identification
Why This Question Is Tricky
Common Mistakes
This problem tests the student's ability to distinguish between average and actual oxidation states derived from molecular structures.
The primary trap is calculating the oxidation state of Cr in CrO5 algebraically as +10, ignoring the two peroxy linkages that limit it to +6.
Secondary traps include assuming all sulfur atoms in Na2S4O6 share the average +2.5 state (which would incorrectly yield r=0) and failing to correctly average the mixed oxidation states in the Br3O8 trimer.
Quick Facts About This Question
Question Information
| Subject | Chemistry |
| Chapter | Redox Reactions - Class 11 Part 2 |
| Concept | Stock Notation Logic |
| Difficulty | 8 |
| Cognitive Load | 7 |
| Target Solve Time | 160 sec |
| Access | Free |