Degree of ionisation is equal to:

total number of moles of the electrolyte present in solution

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total number of moles of the electrolyte dissociated into ions

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number of moles dissociated/ total number of moles dissolved

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total number of moles dissolved/ number of moles dissociated

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Solution

The correct option is C number of moles dissociated/ total number of moles dissolved
Degree of dissociation is the ratio of ionized fraction to the total amount of dissolved solute. Denoted as " $α$ ".
$α = \frac{N u m b e r o f m o l e s d i s s o c i a t e d}{T o t a l m o l e s o f s o l u t e t a k e n}$

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