Four metals A, B, C and D are having standard reduction potential as -3.06, -1.66, -0.40 and 0.80 volt respectively. The most reactive metal is

Options

A. D
B. A
C. C
D. B

Answer

To determine the most reactive metal among A, B, C, and D based on their standard reduction potentials, we can follow these steps:

### Step 1: Understand Standard Reduction Potentials
Standard reduction potential (E°) indicates the tendency of a species to gain electrons (be reduced). The more negative the value, the less likely it is to be reduced, and thus, the more reactive the metal is in terms of losing electrons (being oxidized).

### Step 2: List the Standard Reduction Potentials
Here are the standard reduction potentials for the given metals:
- Metal A: -3.06 V
- Metal B: -1.66 V
- Metal C: -0.40 V
- Metal D: +0.80 V

### Step 3: Compare the Values
To find the most reactive metal, we need to identify which metal has the most negative standard reduction potential:
- A: -3.06 V (most negative)
- B: -1.66 V
- C: -0.40 V
- D: +0.80 V (most positive)

### Step 4: Determine Reactivity
Since metal A has the most negative standard reduction potential (-3.06 V), it is the least likely to be reduced and therefore the most reactive in terms of oxidation.

### Conclusion
The most reactive metal among A, B, C, and D is **Metal A**.

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