Describe modern method for the preparation of fluorine
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Answer:
Dennis Method
Explanation:
Dennis method is,
Pure, dry and anhydrous potassium hydrogen fluoride (KHF₂) is electrolyzed in the molten state at 523 K and when hydrogen is liberated at the cathode while F₂ is liberated at the anode.
Current of 5 amperes and at 12V is employed.
2KHF₂ → 2KF + 2HF
2KF → 2K⁺ + 2F₋
Reaction at anode: 2F⁻ → F₂ ↓ + 2e⁻
Fluorine is produced.
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