Which of the following statements(s) is (are) true?

Options

A. In process of the precipitation of silver sodium dicyano argentate (I), the zinc acts as reducing agent as well as complexing agent
B. In process of the roasting the copper pyrites is converted into a mixture of `Cu_(2)S & FeS` which, in trun are partially oxidised
C. Limonite, haematite and magnesite are ores of iron
D. Tin and lead both are extracted from their ores by self-reduction

Answer

To determine which statements are true, 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 the process of the precipitation of silver sodium diisanoarginate, zinc acts as a reducing agent as well as a complexing agent."
- **Analysis**: The reaction involves zinc reducing Ag^+ (from silver sodium diisanoarginate) to Ag^0. Zinc is indeed acting as a reducing agent here. Additionally, zinc can form complexes, such as Na2ZnCl4, which supports its role as a complexing agent.
- **Conclusion**: **True**

2. **Statement B**: "In the presence of roasting, copper pyrite is converted into a mixture of Cu2S and FeS, which in turn are partially oxidized."
- **Analysis**: Roasting of copper pyrite (CuFeS2) leads to the formation of Cu2S and FeS. The reactions show that Cu2S and FeS are indeed partially oxidized when exposed to oxygen, forming Cu2O and FeO, respectively.
- **Conclusion**: **True**

3. **Statement C**: "Limonite, hematite, and magnesite are ores of iron."
- **Analysis**: Limonite (Fe2O3·3H2O) and hematite (Fe2O3) are ores of iron. However, magnesite (MgCO3) is an ore of magnesium, not iron.
- **Conclusion**: **False**

4. **Statement D**: "Tin and lead both are extracted from their ores by self-reduction."
- **Analysis**: Tin is primarily extracted using carbon reduction methods, while lead can be extracted through both carbon reduction and self-reduction methods. Therefore, the statement that both are extracted by self-reduction is incorrect.
- **Conclusion**: **False**

### Final Answer:
- **True Statements**: A and B
- **False Statements**: C and D