Which of the following process is based on the formation of complex compounds ?

Options

A. Belgian process
B. Mac Arthur Forest process
C. Poling process
D. Mond process

Answer

To determine which of the following processes is based on the formation of complex compounds, we will analyze each option provided:

1. **Belgian Process**:
- The Belgian process involves the distillation of lead and other impurities from ores. This process does not involve the formation of complex compounds. Therefore, it is not the correct answer.

2. **MacArthur Forest Process**:
- In the MacArthur Forest process, gold (Au) and silver (Ag) react with sodium cyanide (NaCN) in the presence of oxygen to form a complex. This complex formation is crucial for the extraction of these metals. Thus, this process is based on the formation of complex compounds.

3. **Polling Process**:
- The polling process is primarily used for the extraction of copper and tin. It involves the concentration of oxidized impurities but does not involve the formation of complex compounds. Therefore, it is not the correct answer.

4. **Mont Process**:
- In the Mont process, nickel reacts with carbon monoxide (CO) at elevated temperatures to form nickel carbonyl, which is a complex compound. Upon heating, this complex decomposes to yield nickel and carbon monoxide. Thus, this process also involves the formation of complex compounds.

Based on the analysis above, the processes that are based on the formation of complex compounds are:
- **MacArthur Forest Process**
- **Mont Process**

**Final Answer**: The processes based on the formation of complex compounds are the MacArthur Forest Process and the Mont Process.

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