Amalgam is

Options

A. alloy
B. submetal
C. compound
D. heterogeneous mixture.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Amalgam**: Amalgam is defined as an alloy that contains mercury. It is formed when mercury is mixed with other metals.

2. **Understanding Alloys**: An alloy is a mixture of two or more metals. When these metals combine, they form a new material with different properties than the individual metals.

3. **Example of Amalgam**: A common example of an amalgam is sodium amalgam, which is formed when sodium is mixed with mercury. This demonstrates that amalgams are specific types of alloys that include mercury.

4. **Properties of Amalgams**: The properties of amalgams can differ significantly from the properties of the individual metals used to create them, which is a characteristic feature of alloys.

5. **Conclusion**: Therefore, amalgam is classified as an alloy, specifically an alloy of mercury with other metals.