Potassium can be prepared by

Options

A. Heating `K_(2)CO_(3)` with coke
B. Electrolysis of fused KOH
C. Heating KF with `CaC_(2)`
D. All the above

Answer

To prepare potassium, we can use the following methods:

### Step-by-Step Solution:

1. **Method 1: Heating K2CO3 with Coke**
- When potassium carbonate (K2CO3) is heated with carbon (coke), a reaction occurs that produces potassium (K) and carbon monoxide (CO).
- The balanced chemical equation for this reaction is:
\[ K_2CO_3 + 2C \rightarrow 2K + 3CO \]
- This indicates that potassium can indeed be prepared using this method.

2. **Method 2: Electrolysis of Fused KOH**
- In this method, potassium hydroxide (KOH) is fused and then subjected to electrolysis.
- At the cathode, potassium ions (K+) gain electrons to form potassium metal (K):
\[ K^+ + e^- \rightarrow K \]
- At the anode, hydroxide ions (OH-) are oxidized to produce oxygen gas (O2) and water (H2O):
\[ 4OH^- \rightarrow O_2 + 2H_2O + 4e^- \]
- The overall reaction can be summarized as:
\[ 2KOH \rightarrow 2K + O_2 + H_2O \]
- This shows that potassium can also be produced through electrolysis of fused KOH.

3. **Method 3: Heating KF with Calcium Carbide**
- When potassium fluoride (KF) is heated with calcium carbide (CaC2) at high temperatures (900-1000 °C), potassium is formed along with calcium fluoride (CaF2) and carbon (C).
- The balanced equation for this reaction is:
\[ 2KF + CaC_2 \rightarrow CaF_2 + 2K + 2C \]
- This indicates that potassium can also be prepared using this method.

### Conclusion:
All three methods can be used to prepare potassium. Therefore, the answer is that potassium can be prepared by all the above methods.