The standard reduction potentials at 298 K for the following half cells are given below:

The number of metal(s) which will be oxidised by in aqueous solution is .

Question

The standard reduction potentials at 298 K for the following half cells are given below:

The number of metal(s) which will be oxidised by  in aqueous solution is .

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Strategy:
 A species (dichromate) will oxidize a metal if the standard cell potential () for the net reaction is positive. This means the reduction potential of the oxidizer () must be higher than the reduction potential of the metal.

Step 1: Comparison of potentials
The oxidizer is dichromate ().
A metal will be oxidized if its .

Step 2: Evaluate the list
1. Fe:  (Oxidizes) ✓
2. Ni:  (Oxidizes) ✓
3. Ag:  (Oxidizes) ✓
4. Au:  (Potential is higher than 1.33, so it won't oxidize) ✗

Conclusion:

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