Among the following which one is the most important ore of silver ?

Options

A. Argentite
B. Horn silver
C. Proustite
D. Ruby silver

Answer

To determine the most important ore of silver among the given options, we will analyze each of the ores listed:

1. **Argentite (Ag2S)**: This is a silver sulfide and is one of the primary ores of silver. It is known for its high silver content.

2. **Horn Silver (AgCl)**: Also known as chlorargyrite, this is a silver chloride and is another significant ore of silver, but it is less common than argentite.

3. **Proustite (Ag3AsS3)**: This is a silver arsenic sulfide and is known for its beautiful red color. It is also an important ore but not as widely mined as argentite.

4. **Robby Silver (Ag3SbS3)**: This is a silver antimony sulfide. While it contains silver, it is not as significant as argentite.

5. **Antimony**: This is not an ore of silver but rather a metalloid that can be associated with some silver ores.

After evaluating the options, the most important ore of silver is **Argentite (Ag2S)**.

### Step-by-Step Solution:
1. **Identify the ores listed**: Argentite, Horn Silver, Proustite, Robby Silver, and Antimony.
2. **Analyze each ore**: Look at their chemical formulas and understand their significance in silver extraction.
3. **Determine the most important ore**: Compare the ores based on their silver content and mining significance.
4. **Conclude**: Argentite is the most important ore of silver.