A mixture contains camphor powder, iron powder and common salt. Identify the separation methods that are employed to separate the constituents from the mixture.

Options

A. Magnet separation, sublimation , addition of water followed by filtration, evaportation
B. handpicking, sieving , addition of water followed by filtration, evaporation
C. Magnet separation, sieving, addition of water followed of filtration , evaportion
D. Magnet separation, sublimation, sedimentation and decantation, evaporation

Explanation

To separate the constituents of a mixture containing camphor powder, iron powder, and common salt, we can follow these steps:

### Step-by-Step Solution:

1. **Magnetic Separation**:
- First, we can use a magnet to separate the iron powder from the mixture. Since iron is magnetic, when we bring a magnet close to the mixture, the iron powder will be attracted to the magnet and can be removed easily.
- **Hint**: Remember that only magnetic substances can be separated using a magnet.

2. **Sublimation**:
- After removing the iron powder, we are left with a mixture of camphor powder and common salt. Next, we can heat the remaining mixture. Camphor undergoes sublimation, which means it will change directly from a solid to a gas when heated.
- **Hint**: Sublimation is a process where a solid turns into gas without becoming a liquid first.

3. **Filtration**:
- Once the camphor has sublimed, we will be left with common salt. To ensure we have only pure common salt, we can dissolve it in water to create a salt solution. After dissolving, we can filter the solution to remove any impurities that may have been present.
- **Hint**: Filtration is a method used to separate solids from liquids.

4. **Evaporation**:
- Finally, we can heat the salt solution to evaporate the water. As the water evaporates, pure common salt will remain.
- **Hint**: Evaporation is a process where liquid turns into vapor, leaving solid residues behind.

### Summary of Separation Methods:
- **Magnetic Separation**: To remove iron powder.
- **Sublimation**: To separate camphor from the mixture.
- **Filtration**: To purify common salt from impurities.
- **Evaporation**: To obtain pure common salt from the salt solution.

### Final Answer:
The separation methods employed are:
1. Magnetic Separation
2. Sublimation
3. Filtration
4. Evaporation