The Anion Which Discharges at Anode With Great Difficulty is - ----------------------- Ions.

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Solution

Anions Discharge at Anode With Great Difficulty:
Anions are negatively charged species.
Thus it will be discharged on an anode ( positively charged electrode).
The anions that lie on the top of the electrochemical series are strong oxidizing agents.
So they form ions easily.
Since sulfate ion is on the top of electrochemical series.
Thus discharged with difficulty.
Hence the anion which discharges at the anode with great difficulty is sulfate ions.

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The anion which discharges at anode with great difficulty is __________ ions.

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