Calomel is the name of

Options

A. `HgCl_(2)`
B. `Hg_(2)Cl_(2)`
C. `HgCl_(2)+Hg`
D. `Hg_(2)Cl_(2)+Hg`

Explanation

To solve the question "Calomel is the name of," we need to identify which chemical compound corresponds to the name "calomel." Let's analyze the options given:

1. **HgCl2**: This is mercury(II) chloride, also known as mercuric chloride. It is not calomel.

2. **Hg2Cl2**: This is mercury(I) chloride, also known as mercurous chloride. This is the correct identification of calomel.

3. **HgCl2 + Hg**: This combination does not represent a specific compound and is not calomel.

4. **Hg2Cl2 + Hg**: Similar to the previous point, this does not represent a specific compound and is not calomel.

Now, we can conclude that calomel is the name of **Hg2Cl2**, or mercurous chloride.

### Step-by-Step Solution:

1. **Identify the compounds**: Look at the given options and identify the chemical formulas.
- HgCl2 (mercuric chloride)
- Hg2Cl2 (mercurous chloride)

2. **Determine the oxidation states**: Understand the oxidation states of mercury in the compounds.
- In HgCl2, mercury has an oxidation state of +2.
- In Hg2Cl2, mercury has an oxidation state of +1.

3. **Recognize the name "calomel"**: Calomel is a historical name for mercurous chloride, which is Hg2Cl2.

4. **Eliminate incorrect options**: Based on the identification and naming, eliminate the options that do not correspond to calomel.
- HgCl2 is not calomel.
- Hg2Cl2 is calomel.
- The other options do not represent a specific compound.

5. **Final conclusion**: The correct answer is Hg2Cl2, which is known as calomel.