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The CORRECT statement (s) is/are:...

The CORRECT statement (s) is/are:

A

In metallurgy of iron, flux is a substance used to convert infusible impurities to fusible mass.

B

Cryolite is `Na_(3)AIF_(6)` and is used in the electrolysis of alumina for lowering the melting point of alumina.

C

Combination of FeO with `SiO_(2)` must be avoided in metallurgy of copper.

D

Lead can be extracted by self reduction of gelena.

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AI Generated Solution

The correct Answer is:
To determine which statements are correct, we will analyze each statement one by one based on the information provided in the video transcript. ### Step-by-Step Solution: 1. **Statement A**: "In metallurgy of iron, flux is a substance which is used to convert infeasible impurities to fusible mass." - **Analysis**: This statement is correct. In the metallurgy of iron, a flux such as limestone is added to remove impurities. The limestone reacts with the impurities to form a fusible mass known as slag, which can be easily removed. 2. **Statement B**: "Cryolite is Na3AlF6 and is used in the electrolysis of alumina for lowering the melting point of alumina." - **Analysis**: This statement is also correct. Cryolite (Na3AlF6) is indeed used in the electrolysis of alumina to lower the melting point from about 2050°C to approximately 950°C. This makes the process more feasible and increases the conductivity of the alumina. 3. **Statement C**: "The combination of FeO with SiO2 must be avoided in the metallurgy of copper." - **Analysis**: This statement is false. In the metallurgy of copper, silica (SiO2) is added to react with iron oxide (FeO) to form iron silicate. This helps in removing iron impurities from copper ore, making the combination of FeO with SiO2 necessary rather than something to be avoided. 4. **Statement D**: "Lead can be extracted by self-reduction of galena." - **Analysis**: This statement is correct. Galena (PbS) can undergo self-reduction when heated in the presence of oxygen, forming lead (Pb) and sulfur dioxide (SO2). This process allows for the extraction of lead from its ore. ### Conclusion: - The correct statements are **A**, **B**, and **D**. - The false statement is **C**. ### Final Answer: The correct statements are A, B, and D. The incorrect statement is C.
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