Consider the reaction `2Ag^(+) + Cd to 2Ag + Cd^(2+)`. The standard reduction potentials of `Ag^(+)//Ag and Cd^(2+)//Cd "are" + 0*80 " volt and " 0*40` volt, respectively.
What is the standard cell emf, `E^@` ?

Explanation

To find the standard cell emf (E°) for the given reaction \(2Ag^+ + Cd \rightarrow 2Ag + Cd^{2+}\), we will follow these steps:

### Step 1: Identify the half-reactions and their standard reduction potentials.

The half-reactions for the given overall reaction are:
1. Reduction of silver ions:
\[
Ag^+ + e^- \rightarrow Ag \quad (E^\circ = +0.80 \, \text{V})
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