Home
Class 12
CHEMISTRY
In a galvanic cell the following reactio...

In a galvanic cell the following reaction takes place at `298^(@)K`
`Cr_(2)O_(7)^(2-)+14H^(+)+6Fe^(2+)to2Cr^(3+)+6Fe^(3+)+7H_(2)O` given that
`:E^(o)(Cr_(2)O_(7)^(2-),H^(+),Cr^(3+)//Pt)=1.33V`
`E^(o)(Fe^(3+),Fe^(2+)//Pt)=0.77V`. The standard e.m.f. of the cell is

A

`(1.33 + 0.77)` V

B

`(1.33 -0.77 ) V`

C

`-(1.33 + 0.77) V`

D

`(-1.33 + 0.77) V`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_("cell")^(@) = E_("cathode")^(@) - E_("anode")^(@)`
`= (1.33 - 0.77)V`
Promotional Banner

Similar Questions

Explore conceptually related problems

Cr_(2)O_(7)^(-2)+14H^(+)+6Fe^(+2)rarr2Cr^(+3)+6Fe^(+3)+7H_(2)O Given : E^(@)(Cr_(2)O_(7)^(-2),H^(+),2Cr^(+3)//Pt)=1.33V , (Fe^(+3),Fe^(+2)//Pt)=+0.77V at 298 K Upon discharge of the cell for 80 min at one ampere, the anode was found to have decreased in mass by

Balance the following equation stepwise: Cr_(2)O_(7)^(2-) + Fe^(2+)++H^(o+)rarrCr^(3+) + Fe^(3+) + H_(2)O

Fe^(2+)(aq.)+Cr_(2)O_(7)^(2-)+H^(+) to Fe^(3+)(aq.)+Cr^(3+)

In the following redox reactionn, Cr_(2)O_(7)^(2-) + Fe^(2+) to Fe^(3+) + Cr^(3+) 1 mole of Cr_(2)O_(7)^(2-) oxidises.

Which of the following statements about the following reaction is // are not correct? Cr_(2)O_(7)^(2-)+3H_(2)O_(2)+8H^(o+)to2Cr^(3+)+7H_(2)O+3O_(2)

Balance the equation by lon-electron method (ix) Cr_(2)O_(7)^(2-) + Fe^(2+) to Fe^(3+) +Cr^(3+) (In acidic medium)