Question

The flux used in the preparation of wrought iron from cast iron in reverberatory furnace is:

• A. SiO\(_2\)
• B. CaCO\(_3\)
• C. C
• D. NaCN

Hint:

Calcium carbonate (\(CaCO_3\)) acts as a flux to remove acidic impurities such as silica (\(SiO_2\)) in metallurgy.

Answer 1

The Correct Option is B

Step 1: Understanding Flux in Iron Extraction
- Flux is a substance used in metallurgy to remove impurities by forming slag.
- In wrought iron production, the impurities (SiO\(_2\)) are removed using CaCO\(_3\) (Limestone) as a flux. Step 2: Reaction Involved \[ CaCO_3 \rightarrow CaO + CO_2 \] \[ CaO + SiO_2 \rightarrow CaSiO_3 { (Slag)} \] Step 3: Explanation
- SiO\(_2\) is an impurity, not a flux.
- C (carbon) is used as a reducing agent.
- NaCN is not used in iron metallurgy.
Thus, the correct answer is CaCO\(_3\).