Preferential discharge theory : In accordance to this theory If more than one type of the ion is attracted towards a particular electrode, then the ion is discharged one which needs least energy or ions with the lower discharge potential or which occur low in electrochemical series.
The potential at which the ion is discharged or deposited on the appropriate electrode is termed the discharge or deposition potential, (DP). The values of the discharge potential are different for different ions.
The decreasing order of discharge potential or increasing order of the deposition of some of the ions can be given as,
For cations : 
For anions: 
Table: Products of electrolysis of some electrolytes
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