For the cell prepared from electrode A and B, electrode A:`(Cr_2O_7^(2-))/(Cr^(3+)), E_("red")^(0)=+1.33V` and electrode B :`(Fe^(3+))/(Fe^(2+)), E_("

Question

For the cell prepared from electrode A and B, electrode A:`(Cr_2O_7^(2-))/(Cr^(3+)), E_("red")^(0)=+1.33V` and electrode B :`(Fe^(3+))/(Fe^(2+)), E_("

For the cell prepared from electrode A and B, electrode A:`(Cr_2O_7^(2-))/(Cr^(3+)), E_("red")^(0)=+1.33V` and electrode B :`(Fe^(3+))/(Fe^(2+)), E_("red")^(0)=0.77 V`, which of the following statement is not correct ?
A. The electrons will flow B to A (in the outer circuit) when connections are made.
B. The standard e.m.f. of the cell with be 0.56 V
C. A will be positive electrode
D. None of the above

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
A acts as cathode and B acts as anode because reduction potential of A is more.
Anode is B `implies` is negative electrode.
`implies` electrons flow from B to A .
`implies` e.m.f=(1.33-0.77) V

4 views Answered 2023-02-05 15:29