Which of the following pair contains complex salt and double salt respectively?

Options

A. `FeSO_(4),K_(4)[Fe(CN)_(6)]`
B. `[Cu(NH_(3))_(4)]SO_(4),FeSO_(4).7H_(2)O`
C. `[Cu(NH_(3))_(4)]SO_(4),K_(2)SO_(4)Al_(2)(SO_(4))_(3).24H_(2)O`
D. `MgSO_(4).7H_(2)O,CuSO_(4).5H_(2)O`

Answer

To solve the question regarding which pair contains a complex salt and a double salt respectively, we can follow these steps:

### Step 1: Understand the Definitions
- **Double Salt**: A double salt is formed by the crystallization of two different salts, which can dissociate into their respective ions in solution. An example of a double salt is Mohr's salt (FeSO4·(NH4)2SO4·6H2O).

- **Complex Salt**: A complex salt contains a central metal atom or ion surrounded by molecules or ions (ligands). Complex salts do not dissociate into simple ions in solution. An example is [Cu(NH3)4]SO4, where copper is the central metal ion surrounded by ammonia ligands.

### Step 2: Analyze the Given Options
We need to analyze the pairs provided in the question to identify which one contains a double salt and which one contains a complex salt.

### Step 3: Identify the Correct Pair
- Look for a pair where one is a known double salt and the other is a known complex salt.
- Based on the definitions, we can check the options provided (though they are not explicitly listed here).

### Step 4: Conclusion
After analyzing the options, we find that option C contains:
- **Double Salt**: Aluminum sulfate (Al2(SO4)3) and potassium sulfate (K2SO4) crystallized together.
- **Complex Salt**: A complex compound such as [Cu(NH3)4]SO4.

Thus, the correct answer is **option C**.