Scheelite `(CaWO_(4))` is an ore of tungsten which contain tungstate
ion, Tungsten is also present in

Options

A. Limonite
B. Dolomite
C. Wolframite
D. Siderite

Answer

To solve the question regarding the presence of tungsten in ores, we will analyze the given information step by step.

### Step 1: Understanding Scheelite
Scheelite is represented by the chemical formula \( \text{CaWO}_4 \). It is known to be an ore of tungsten, which means it contains the tungstate ion \( \text{WO}_4^{2-} \).

**Hint:** Remember that ores are naturally occurring minerals from which metals can be extracted.

### Step 2: Identifying Other Tungsten Ores
The question asks where else tungsten is present. We need to identify other minerals or ores that contain tungsten.

**Hint:** Look for other common tungsten ores or minerals in addition to Scheelite.

### Step 3: Exploring Wolframite
One of the most significant ores of tungsten is Wolframite, which has the chemical formula \( \text{FeWO}_4 \). This mineral also contains the tungstate ion and is a major source of tungsten.

**Hint:** Check the formulas of known tungsten ores to confirm their composition.

### Step 4: Evaluating Other Options
Next, we will evaluate other minerals mentioned in the video transcript:
- **Limonite**: \( \text{Fe}_2\text{O}_3 \cdot 3\text{H}_2\text{O} \) - does not contain tungsten.
- **Dolomite**: \( \text{CaCO}_3 \cdot \text{MgCO}_3 \) - does not contain tungsten.
- **Siderite**: \( \text{FeCO}_3 \) - does not contain tungsten.

**Hint:** Eliminate options that do not contain tungsten based on their chemical formulas.

### Step 5: Conclusion
From the analysis, we conclude that the correct answer for another ore of tungsten, besides Scheelite, is Wolframite.

**Final Answer:** Tungsten is also present in Wolframite \( (\text{FeWO}_4) \).

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