`K_(4)Fe(CO)_(6)` is considered to a be a complex but potash alum is_____and bleaching powder is ________ .

Answer

To answer the question, we need to classify the given substances based on their chemical nature.

### Step-by-Step Solution:

1. **Identify the nature of K₄Fe(CO)₆:**
- K₄Fe(CO)₆ is a coordination compound where the iron (Fe) is surrounded by carbon monoxide (CO) ligands.
- Coordination compounds do not completely dissociate into ions in solution. Instead, they maintain their structure as a complex.

**Hint:** Look for compounds that have a central metal atom surrounded by ligands.

2. **Determine the nature of Potash Alum:**
- Potash alum is represented by the formula K₂SO₄·Al₂(SO₄)₃·24H₂O.
- It is classified as a double salt, which means it is formed from the combination of two different salts.
- Double salts dissociate completely into their constituent ions when dissolved in water.

**Hint:** Double salts are formed from two different salts and dissociate completely in solution.

3. **Analyze Bleaching Powder:**
- Bleaching powder, commonly known as calcium oxychloride, has the formula Ca(OCl)₂.
- It is not a pure compound but rather a mixture of several compounds, including calcium chloride (CaCl₂), calcium hydroxide (Ca(OH)₂), and water.
- Mixtures do not have a fixed composition and do not form a single type of ion in solution.

**Hint:** Mixtures consist of two or more substances that retain their individual properties.

### Final Answer:
- K₄Fe(CO)₆ is considered to be a complex.
- Potash alum is a double salt.
- Bleaching powder is a mixture.