Which one is a mixed salt

Options

A. `NaHSO_(4)`
B. `NaKSO_(4)`
C. `K_(4)Fe(CN)_(6)`
D. `Mg(OH)Cl`

Explanation

To determine which one is a mixed salt, we need to understand the definition of mixed salts and analyze the given options.

### Step-by-Step Solution:

1. **Understand the Definition of Mixed Salt**:
- A mixed salt is formed when two or more simple salts are combined. This means that a mixed salt contains more than one type of cation or anion.

2. **Identify the Given Options**:
- The options provided include various salts such as NaHSO4, NaCl, KCl, H2SO4, and Ba(HSO4)2.

3. **Analyze Each Option**:
- **NaHSO4**: This is a single salt consisting of sodium (Na+) and hydrogen sulfate (HSO4-). It is not a mixed salt.
- **NaCl**: This is sodium chloride, consisting of sodium (Na+) and chloride (Cl-). It is also a single salt.
- **KCl**: This is potassium chloride, consisting of potassium (K+) and chloride (Cl-). This is a single salt as well.
- **H2SO4**: This is sulfuric acid, which is not a salt but an acid.
- **Ba(HSO4)2**: This is barium hydrogen sulfate, which contains barium (Ba2+) and hydrogen sulfate (HSO4-). This is also a single salt.

4. **Identify Mixed Salt**:
- Since none of the options provided are mixed salts, we need to look for combinations that contain more than one type of cation or anion. For example, a combination of NaCl and KCl would be a mixed salt.

5. **Conclusion**:
- Based on the analysis, if we had an option that combined two different salts such as NaCl and KCl, that would be considered a mixed salt. However, from the options given, none qualify as a mixed salt.

### Final Answer:
- None of the provided options are a mixed salt. A mixed salt would require a combination of different simple salts.