Home
Class 12
CHEMISTRY
The standard free energy change (in J) f...

The standard free energy change (in J) for the reaction `3Fe^(2+)(aq)+2Cr(s)to2Cr^(3)+3Fe(s)` given `E_(Fe^(2+)//Fe)^(0)=-0.454V and E_(Cr^(3+)//Cr)^(0)=-0.74V is (F=96500C)`

A

57900

B

`-57,900`

C

173700

D

173700

Text Solution

Verified by Experts

The correct Answer is:
C
`3F^(2+)+2Crrarr2Cr^(3+)+3Fe`
`E_("cell")^(0)=(-0.44)+(0.74)=0.3 ` volt
n=6
`DeltaG^(@)=-nFE^(@)=-(6xx69500xx0.3)J`
=-173,700
Promotional Banner

Topper's Solved these Questions

  • KVPY

    KVPY PREVIOUS YEAR|Exercise Part A - Chemistry|20 Videos

  • KVPY

    KVPY PREVIOUS YEAR|Exercise Part B- Chemistry|10 Videos

  • KVPY

    KVPY PREVIOUS YEAR|Exercise PART-2 (CHEMISTRY)|10 Videos

  • KVPY 2021

    KVPY PREVIOUS YEAR|Exercise PART II CHEMISTRY|10 Videos

Similar Questions

Explore conceptually related problems

Under standered condition Delta G^(@) for the reaction 2Cr(s)= 3Cd^(2+)(aq) rarr 2Cr_((a a))^(3+) +3Cd(s) is (E_(Cr^(3+)//Cr)^(@) = - 0.74 V, E_(Cd^(2+)//Cd)^(@) = - 0.4 V)

Calculate the standard cell potentials of the galvanic cells in which the following reactions take place. (a) " " 2Cr(s)+3Cd^(2+) to 2Cd^(3+)(aq)+3Cd(s) Given E_(Cr^(3+)//Cr)^(@)=-0.74" V" , E_(Cd^(2+)//Cd)^(@)=-0.40" V" (b) " " Fe^(2+)(aq)+Ag^(+)(aq) to Fe^(3+)(aq)+Ag(s) Gievn E_(Ag^(+)//Ag)^(@)=0.80" V" ,E_(Fe^(3+)//Fe^(2+))^(@)=0.77 " V" Also calculate DeltaG^(@) and equilibrium constant for the reaction.

Find out work done for the given cell Cr| Cr^(+3)|| Fe^(+2)| Fe E_(Cr//Cr^(2+))^(@) = 0.74V, E_(Fe^(2+)//Fe)^(@) = -0.44V

If E_(Fe^(2+)//Fe)^(@)=-0.440 V and E_(Fe^(3+)//Fe^(2+))^(@)=0.770 V , then E_(Fe^(3+)//Fe)^(@) is -

Calculate the standard reduction potentials of galvanic cells in which reaction are Fe^(2+) (aq) + Ag^(+) (aq) to Fe^(3+) (aq) + Ag (s) Given that E^(Theta) (Cr^(3+) //Cr) = -0.74 V , E^(Theta) (Cd^(2+) // Cd) = -0.40 V , E^(Theta) (Fe^(3+) // Fe^(2+)) = 0.77 V , E^(Theta) (Ag^(+) // Ag) = 0.80 V