The process of combining metals present in their native ores with mercury to form an alloy is called

Options

A. alloying
B. galvanisation
C. amalgamation
D. crystallisation

Answer

To solve the question, we need to identify the process of combining metals present in their native ores with mercury to form an alloy. Let's break down the steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the name of the process that involves combining metals from their native ores with mercury to create an alloy.

2. **Identifying the Key Terms**:
- **Native Ores**: These are naturally occurring minerals from which metals can be extracted.
- **Mercury**: A metal that can form alloys with other metals.
- **Alloy**: A mixture of two or more metals.

3. **Recognizing the Process**: The process of combining metals with mercury specifically to form an alloy is known as **Amalgamation**.

4. **Defining the Resulting Alloy**: The alloy formed by this process is called an **Amalgam**.

5. **Evaluating the Options**:
- **Alloying**: This refers to mixing metals in general, not specifically with mercury.
- **Galvanization**: This is a method to prevent rusting, unrelated to the question.
- **Amalgamation**: This is the correct term for the process described.
- **Crystallization**: This refers to the formation of solid crystals from a solution, also unrelated.

6. **Conclusion**: The correct answer to the question is **Amalgamation**.

### Final Answer:
The process of combining metals present in their native ores with mercury to form an alloy is called **Amalgamation**.

---