Phosphorus is manufactred by heating in an electric furnace a mixture of

Options

A. Bone ash and coke
B. Bone ash and silica
C. Bone ash, silica and coke
D. None of these

Explanation

To manufacture phosphorus, we need to heat a mixture of specific substances in an electric furnace. The process involves the following steps:

### Step-by-Step Solution:

1. **Identify the Raw Materials**: The primary raw materials for phosphorus production are:
- Bone ash (which contains calcium phosphate, Ca3(PO4)2)
- Silica (SiO2)
- Coke (carbon)

2. **Chemical Reaction**: The first reaction occurs when bone ash is heated with silica. The reaction can be represented as:
\[ 2 \text{Ca}_3(\text{PO}_4)_2 + 6 \text{SiO}_2 \rightarrow 6 \text{CaSiO}_3 + \text{P}_4\text{O}_{10} \]
Here, calcium silicate (CaSiO3) and phosphorus pentoxide (P4O10) are produced.

3. **Balancing the Reaction**: In the balanced equation, we ensure that the number of atoms for each element is the same on both sides. The balanced equation shows that for every 2 moles of calcium phosphate, 6 moles of silica are required.

4. **Second Reaction**: The phosphorus pentoxide (P4O10) produced in the first reaction is then reacted with coke at high temperatures (around 1770 K):
\[ \text{P}_4\text{O}_{10} + 10 \text{C} \rightarrow 4 \text{P} + 10 \text{CO} \]
This reaction produces elemental phosphorus (P) and carbon monoxide (CO).

5. **Conclusion**: Therefore, the correct mixture to manufacture phosphorus in an electric furnace consists of bone ash, silica, and coke.

### Final Answer:
Phosphorus is manufactured by heating in an electric furnace a mixture of bone ash, silica, and coke.