For the cell prepared from electrode and electrons \[ \begin{array}{l} A: \mathrm{Cr}_{2} \mathr...

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For the cell prepared from electrode and electrons
\[
\begin{array}{l}
A: \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{Cr}^{3+}, E_{\text {red }}^{\circ}=+1.33 \mathrm{~V} \\
B: \mathrm{Fe}^{3+} \mid F e^{2+}, E_{\text {red }}^{0}=0.77 \mathrm{~V} .
\end{array}
\]
Which of the following stament is correct
1) The electrons will flow from \( B \) to \( A \) when connection is made
2) The e.m.f. of the cell will be \( 0.56 \mathrm{~V} \)
3) A will be positive electrode
4) All of the above
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