1.

Match the items of Column-I and Column-II on the basis of data given below: E_(F_(2)|F^(-))^(Theta)=2.87V,E_(Li^(+)|Li)^(Theta)=-3.5V, E_(Au^(3+)|Cu)^(Theta)=1.4V,E_(Br_(2)|Br^(-))^(Theta)=1.09V

Answer»

SOLUTION :`(Ato3),(Bto1),(Cto7),(Dto5),(Eto4),(Fto2),(Gto6)`
* The following emf SERIES is obtained by following `E^(@)` value

* Any half cell reaction : A+`e^(-)toB`
experiencing reduction`to`PRODUCT of reduction.
oxidizing agent`to`reducing agent.
(A) `F_(2)` : is non-metal and `E^(@)` is maximum. So `F_(2)` is REDUCED easily and is strongest oxidizing agent.
(B) Li : is metal, apart from this Au is another metal. Between these two metals Li has high `E^(@)` value so Li is strongest oxidizng agent.
(C) `Au^(3+)` is metal ion. it has high reduction potential and so `Au^(3+)` is oxidizing agent.
(D) `Br^(-)` is negative ion. Oxidation half reaction:
`Br^(-) to (1)/(2)Br` So, oxidation of `Br^(-)` is occur.
`3Br^(-) to (3)/(2)Br_(2)+3e^(-)` (Oxidation) `E^(THETA)=1.09V`
`Au^(3+)+3e^(-) to Au` (Reduction) `E^(Theta)=1.4V`
(E) Au is inert metal because all metals have high `E^(@)` value.
(F) `Li^(+)` is metal ions and standard reduction potential is `E^(@)` is low -3.5 V and so it is weak oxidizing agent.
(G) `F^(-)` is negative ion and its oxidation `F^(-) to F_(2)` and so `F^(-)` is reducing agent and `E^(@)` is maximum so it is weak reducing agent.


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