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Question #44325
The Question
The ability of oxygen to stabilize high oxidation states of transition metals often exceeds that of fluorine. This is because oxygen can form multiple bonds () with the metal, whereas fluorine stabilizes high oxidation states primarily through high lattice energy in the solid state.
Consider the highest stable binary oxide and the highest stable binary fluoride of Manganese at . Let = Oxidation state of Mn in its highest binary oxide. Let = Oxidation state of Mn in its highest binary fluoride. Let = Total number of bonds in one discrete molecule of the highest binary oxide. Let = Number of unpaired electrons in the central metal ion of the highest binary fluoride. Let = Coordination number of Mn in the highest binary oxide. Let = Coordination number of Mn in the solid-state structure of the highest binary fluoride.
Calculate the value of the expression: .
Options
- A.
48
- B.
46
- C.
42
- D.
69
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Mechanism_Trap
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Concepts Behind This Question
d-block Variable Oxidation States|Stability of High O.S. Fluorides/Oxides|Lattice Energy Factors
Why This Question Is Tricky
Common Mistakes
This question tests the 'Chemical Exception' where students often incorrectly assume that fluorine, being the most electronegative element, will always stabilize the highest oxidation state of a transition metal.
The hidden variable is the bonding mechanism: oxygen stabilizes extreme oxidation states (like +7 in Mn) via covalent multiple bonding, which minimizes steric crowding (coordination number 4).
Fluorine can only form single bonds, relying on high lattice energy for stabilization, but is sterically capped (coordination number 6), limiting Mn to +4 in \ce{MnF4}.
The problem also traps students who assume \ce{MnF4} is a discrete tetrahedral molecule rather than an octahedral polymer in the solid state.
Quick Facts About This Question
Question Information
| Subject | Chemistry |
| Chapter | Classification of Elements and Periodicity in Properties - Class 11 Part 1 |
| Concept | d-block Variable Oxidation States |
| Difficulty | 8 |
| Cognitive Load | 7 |
| Target Solve Time | 160 sec |
| Access | Free |