Which of the following is/are the mixed salts?

Options

A. Rochelle's salt
B. Bleaching powder
C. Calcium hypochlorite
D. Mohr's salt

Answer

To determine which of the given options are mixed salts, we need to understand the definition of mixed salts. Mixed salts, also known as double salts, are compounds that consist of two or more different salts that crystallize together in a fixed ratio.

Let's analyze the given options step by step:

1. **Rhodial Salt (Potassium Sodium Tartarate Tetrahydrate)**:
- Formula: KNaC4H4O6·4H2O
- This salt is a combination of potassium tartarate and sodium tartarate.
- Since it consists of two different salts, it qualifies as a mixed salt.

2. **Bleaching Powder (Calcium Hypochlorite)**:
- Formula: Ca(OCl)2
- Bleaching powder is composed of calcium and hypochlorite ions.
- It does not consist of two different salts crystallized together; hence, it is not a mixed salt.

3. **Calcium Hypochlorite**:
- As mentioned above, this is the same as bleaching powder and is not a mixed salt.

4. **More Salt (Aluminium Ferrous Sulfate Hexahydrate)**:
- Formula: (NH4)2Fe(SO4)2·6H2O
- More salt is a combination of ferrous sulfate and ammonium sulfate.
- Since it consists of two different salts, it qualifies as a mixed salt.

**Conclusion**:
- The mixed salts among the given options are:
- Rhodial Salt (1)
- More Salt (4)

Thus, the correct options are 1 and 4.