Common salt is a mixture of

Options

A. sodium chloride and magnesium chloride
B. sodium chloride and iodine
C. sodium chloride, iodine and potassium iodide
D. sodium chloride, sodium iodide or potassium iodide

Answer

**Step-by-Step Text Solution:**

1. **Identify Common Salt**: Common salt is primarily known as sodium chloride (NaCl). This is the main component of table salt that we use in our daily lives.

2. **Understand the Need for Iodine**: Iodine is an essential nutrient for our body, particularly for the proper functioning of the thyroid gland. A deficiency in iodine can lead to health issues, such as goiter, which is characterized by the swelling of the thyroid gland.

3. **Iodized Salt**: To prevent iodine deficiency, common salt is often iodized. This means that iodine is added to the salt. The forms of iodine that are typically added include sodium iodide (NaI) and potassium iodide (KI).

4. **Components of Common Salt**: Therefore, common salt can be considered a mixture of:
- Sodium chloride (NaCl)
- Sodium iodide (NaI)
- Potassium iodide (KI)

5. **Evaluate Options**: When evaluating the options provided:
- Option 1: Sodium chloride and magnesium chloride - Incorrect, as magnesium chloride is not used in common salt.
- Option 2: Sodium chloride and iodine - Incorrect, as iodine is not used in its elemental form in salt.
- Option 3: Sodium chloride, iodine, and potassium iodide - Incorrect, as iodine is not used alone.
- Option 4: Sodium chloride, sodium iodide, and potassium iodide - Correct, as these are the components of iodized salt.

6. **Conclusion**: The correct answer is that common salt is a mixture of sodium chloride, sodium iodide, and potassium iodide.

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