Why is Bi(V) a stronger oxidant/oxidizing agent than Sb (V)?

Bi (V) means Bi has lost 5 electrons and it is in a +5 oxidation state. Bi (V) is a stronger oxidizing agent than Sb (V) means that it will pick electrons from a reducing agent (electron donor) much faster than Sb (V) to go from a unstable +5 to a more stable +3 oxidation state. Remember that two electrons have been gained to go from +5 to +3 oxidation state. 

Definition- Electrochemical Series

In the electrochemical series, the electrodes are arranged in the increasing order of their reduction potential under standard conditions of 1M electrolyte concentration, 298 K temperature, and 1 bar atmospheric pressure.

It is also known as the activity series as the activities of two different electrodes towards displacement reaction are compared; whether the electrode under standard reaction condition will have reduction potential or oxidation potential.

Definition- Electrochemistry

A branch of chemistry that deals with the interconversion of chemical energy and electrical energy taking place via the redox reactions.  
It studies how a spontaneous redox reaction capable of generating chemical energy converts it into electrical energy. Example, Electrochemical cell. 
Or how the use of electrical energy can bring about a non-spontaneous chemical reaction. Example, Electrolytic cell.



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