Which of the following pair can be refined using some basic principle?

Options

A. Cu,Ag
B. Si,Ge
C. Ti,Ni
D. All of these

Answer

To determine which pairs can be refined using basic principles, we need to analyze the reactivity of the metals in each pair and the refining processes applicable to them. The refining processes are based on the reactivity series of metals, which categorizes them into three groups: highly reactive, moderately reactive, and native (or noble) metals.

### Step-by-Step Solution:

1. **Identify the Pairs**: The pairs given are:
- CU (Copper) and AG (Silver)
- Silicon and Gallium
- Titanium and Nickel

2. **Classify the Metals**:
- **Copper (Cu)**: Copper can exhibit both native and moderately reactive properties.
- **Silver (Ag)**: Silver is a native metal (noble metal).
- **Silicon**: Silicon is a metalloid and is considered moderately reactive.
- **Gallium**: Gallium is also moderately reactive.
- **Titanium (Ti)**: Titanium is a highly reactive metal.
- **Nickel (Ni)**: Nickel is classified as a moderately reactive metal.

3. **Determine the Refining Processes**:
- **Native Metals (like Ag)**: These can be refined using hydro refining processes.
- **Moderately Reactive Metals (like Cu, Si, Ga, Ni)**: These can be refined using pyrometallurgy.
- **Highly Reactive Metals (like Ti)**: These require electrolysis for refining.

4. **Analyze Each Pair**:
- **CU and AG**: Copper can be refined using hydro refining due to its native properties, and silver is a native metal. Thus, this pair can be refined using basic principles.
- **Silicon and Gallium**: Both are moderately reactive metals, and they can be refined using pyrometallurgy. Therefore, this pair can also be refined.
- **Titanium and Nickel**: Titanium is highly reactive and requires electrolysis for refining, while nickel is moderately reactive and can be refined using pyrometallurgy. Thus, this pair can also be refined.

5. **Conclusion**: All pairs (CU and AG, Silicon and Gallium, Titanium and Nickel) can be refined using basic principles.

### Final Answer:
All the pairs (CU and AG, Silicon and Gallium, Titanium and Nickel) can be refined using some basic principles.