Question

Consult the table of standard electrode potentials and suggest three substances that can oxidize ferrous ions under suitable conditions.

Answer 1

Hint: The standard electrode potential of ferrous ions is \[0.77\,V\] . Electrochemical series is an arrangement of standard electrode potentials in the order of decreasing reactivity or in the order of decreasing ease of oxidation.

Complete step by step answer:
Electrode potential is defined as the measure of the potential difference between two cells in an electrochemical cell. It is used to measure the voltage present between the two half cells. In an electrochemical cell, oxidation takes place at one electrode, that is, anode and reduction takes place at another electrode, that is cathode.
Electrochemical series is an activity series that contains a list of metals in the order of decreasing reactivity or in the order of decreasing ease of oxidation. In this series, the metals which are at top, such as alkali metals and alkaline earth metals, are more reactive or get most easily oxidized than the metals that are at the bottom of the series. These metals are at the top of the series, and therefore they are known as the active metals. This means that the metals that are at top can react very easily to form compounds. The metals that have higher reduction potential than ferrous ions, can easily oxidise ferrous ions to form ferric ions. Substances that are stronger oxidizing agents than ferrous ions, can oxidise ferrous ions.
Three substances that can oxidize ferrous ions are bromine, chlorine and silver.
$B{{r}_{2}}+2{{e}^{-}}\to B{{r}^{-}}E{}^\circ =1.06\,V$
$C{{l}_{2}}+2{{e}^{-}}\to C{{l}^{-}}E{}^\circ =1.36\,V$
$A{{g}^{+}}+{{e}^{-}}\to AgE{}^\circ =0.80\,V$
These elements lie below the iron in the electrochemical series.

Additional information:
The standard electrode potential is the potential of a half reaction that is measured against the standard hydrogen electrode under standard conditions. The standard electrode potential of hydrogen is zero

Note: The metals that have higher reduction potential than iron, will oxidize iron. These metals are silver, bromine and chlorine.
The standard electrode potential of hydrogen is zero.
standard electrode potential is used to calculate the cell potential under standard conditions such as pressure at one atmosphere.