Arrange the following steps in a sequence for the manufacture of common salt.
(1) recrystallisation
(2) evaporation of sea water
(3) addition of sodium iodide and potassium iodide
(4) dissolution in water
(5) formation of crude salt

Options

A. 25413
B. 24513
C. 23415
D. 12543

Explanation

To arrange the steps in the sequence for the manufacture of common salt, we need to follow the logical process of how salt is obtained from seawater. Here’s the step-by-step solution:

1. **Evaporation of Sea Water**: The process begins by collecting seawater and allowing it to evaporate. This step is crucial as it concentrates the salt present in the seawater.

2. **Formation of Crude Salt**: As the seawater evaporates, the salt begins to crystallize and we obtain what is known as crude salt. This is the initial form of salt that contains impurities.

3. **Dissolution in Water**: The crude salt is then dissolved in water. This step helps to separate the impurities from the salt crystals.

4. **Recrystallisation**: After dissolving the crude salt, the solution is then evaporated again to allow the pure salt to crystallize. This process is known as recrystallisation and it helps in obtaining purer salt.

5. **Addition of Sodium Iodide and Potassium Iodide**: Finally, to enhance the nutritional value of the salt and prevent iodine deficiency, sodium iodide (NaI) and potassium iodide (KI) are added to the pure salt.

So, the correct sequence of steps is:
(2) Evaporation of sea water → (5) Formation of crude salt → (4) Dissolution in water → (1) Recrystallisation → (3) Addition of sodium iodide and potassium iodide.

### Final Sequence:
1. Evaporation of sea water (2)
2. Formation of crude salt (5)
3. Dissolution in water (4)
4. Recrystallisation (1)
5. Addition of sodium iodide and potassium iodide (3)

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