Some of the following are true solutions :
`{:("I : Air"," II : Sea water"),("III : Glucose solution"," IV : Gem store"),("V : Pearl"," VI : Blood"):}`
Select true solutions :

Options

A. I,II,III
B. II,III,IV,V
C. I,IV,V,VI
D. II,IV,VI

Answer

To determine which of the given options are true solutions, we need to understand the definition of true solutions. True solutions are homogeneous mixtures where the solute particles are less than 1 nanometer in size and are completely dissolved in the solvent, resulting in a transparent solution.

Let's analyze each option step by step:

1. **Air**:
- Air is a mixture of various gases (like nitrogen, oxygen, carbon dioxide, etc.) and is considered a true solution because the size of the gas particles is less than 1 nanometer.
- **Conclusion**: Air is a true solution.

2. **Sea Water**:
- Sea water is a solution of salt (sodium chloride) dissolved in water. The salt particles are also less than 1 nanometer in size when dissolved, making it a true solution.
- **Conclusion**: Sea water is a true solution.

3. **Glucose Solution**:
- A glucose solution is formed when glucose (a solid) dissolves in water. The glucose molecules are small enough (less than 1 nanometer) to be considered a true solution.
- **Conclusion**: Glucose solution is a true solution.

4. **Gemstone**:
- Gemstones are solid materials and do not form a solution. They are not dissolved in any solvent, hence they do not meet the criteria for a true solution.
- **Conclusion**: Gemstone is not a true solution.

5. **Pearl**:
- Pearls are solid objects and do not dissolve in a solvent, so they cannot be classified as a true solution.
- **Conclusion**: Pearl is not a true solution.

6. **Blood**:
- Blood is a colloidal solution, which means it contains larger particles (like cells and proteins) that are between 1 nanometer and 1000 nanometers in size. Therefore, it does not qualify as a true solution.
- **Conclusion**: Blood is not a true solution.

**Final Selection of True Solutions**:
Based on the analysis, the true solutions from the given options are:
- I: Air
- II: Sea Water
- III: Glucose Solution

### Answer:
The true solutions are: Air, Sea Water, and Glucose Solution.