What is the decreasing order of standard oxidation potential of K,Ca and LI:-

Options

A. `Ca, Li,K`
B. `Li, Ca,K`
C. `Li,K,Ca`
D. `K, Ca, Li`

Answer

To determine the decreasing order of standard oxidation potential for potassium (K), calcium (Ca), and lithium (Li), we can follow these steps:

### Step 1: Understand the Groups
- **Identify the elements**: Lithium (Li) is an alkali metal from Group 1, while Calcium (Ca) is an alkaline earth metal from Group 2. Potassium (K) is also an alkali metal from Group 1.

### Step 2: Recall the Trends in Oxidation Potential
- **Trends in oxidation potential**:
- For alkali metals (Group 1), the standard oxidation potential decreases as you move down the group. This means that lithium has a higher oxidation potential than potassium.
- For alkaline earth metals (Group 2), the standard oxidation potential also increases down the group, but we are comparing it with alkali metals.

### Step 3: Compare the Elements
- **Oxidation potential values**:
- Lithium (Li) has the highest standard oxidation potential among the three.
- Potassium (K) has a lower standard oxidation potential than lithium but is higher than calcium.
- Calcium (Ca) has the lowest standard oxidation potential among the three.

### Step 4: Write the Decreasing Order
- **Final order**: Based on the trends and comparisons, the decreasing order of standard oxidation potential is:
- **Li > K > Ca**

### Conclusion
- Therefore, the correct decreasing order of standard oxidation potential for K, Ca, and Li is:
- **Li > K > Ca**