Which of the following contains calcium

Options

A. Chalcocite
B. Carnallite
C. Cassiterite
D. Dolomite

Answer

To determine which of the given options contains calcium, we will analyze each option by writing down their chemical formulas and identifying the presence of calcium (Ca).

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options (A, B, C, D) which are ores. We need to analyze each one to check for the presence of calcium.

2. **Analyze Option A - Chalcopyrite**:
- The formula for chalcopyrite is \( \text{CuFeS}_2 \) (Copper Iron Sulfide).
- This compound does not contain calcium.
- **Conclusion**: Option A does not contain calcium.

3. **Analyze Option B - Carnallite**:
- The formula for carnallite is \( \text{KCl} \cdot \text{MgCl}_2 \cdot 6\text{H}_2\text{O} \) (Potassium Magnesium Chloride Hydrate).
- This compound also does not contain calcium.
- **Conclusion**: Option B does not contain calcium.

4. **Analyze Option C - Cassiterite**:
- The formula for cassiterite is \( \text{SnO}_2 \) (Tin Oxide).
- This compound does not contain calcium.
- **Conclusion**: Option C does not contain calcium.

5. **Analyze Option D - Dolomite**:
- The formula for dolomite is \( \text{CaMg(CO}_3\text{)}_2 \) (Calcium Magnesium Carbonate).
- This compound contains calcium (Ca).
- **Conclusion**: Option D contains calcium.

6. **Final Answer**: Based on the analysis, the correct option that contains calcium is **Option D (Dolomite)**.