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Question

According to preferential discharge theory, out of number of ions the one which requires ___________ energy will be liberated ________ at a given electrode.

A
least, first
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B
least, last
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C
higher, first
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D
highest, last
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Solution

The correct option is A least, first
The ions which required the least energy will be liberated first at a given electrode.
The cation that has a cover position in the electrochemical series is preferentially discharged whereas, an anion that has higher position in electrochemical series is preferentially discharged.

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