An example of near ideal solution is:

Options

A. n-heptane and n-hexane
B. `CH_3COOH+C_5H_5N`
C. `CHCl_3 +(C_2H_5)_2O`
D. `H_2O+HNO_3`

Answer

To determine an example of a near ideal solution, we need to understand the characteristics of ideal and non-ideal solutions, particularly in relation to Raoult's law.

### Step-by-Step Solution:

1. **Understanding Ideal Solutions**:
- Ideal solutions are those that obey Raoult's law throughout the entire range of concentrations. This means that the vapor pressure of the solution is directly proportional to the mole fraction of the solvent.

2. **Identifying Characteristics of Near Ideal Solutions**:
- Near ideal solutions typically consist of components that have similar molecular structures. This similarity allows them to interact in a way that closely resembles the interactions in pure components.

3. **Analyzing the Given Options**:
- We need to evaluate the provided options to identify which pair of substances has similar molecular structures.

4. **Evaluating Each Option**:
- **Option 1: n-heptane and n-hexane**: Both are alkanes and have similar structures, differing only in the number of carbon atoms (7 for n-heptane and 6 for n-hexane). This similarity in structure suggests they are likely to form a near ideal solution.

- **Option 2: Acetic Acid and C5H5N**: These have different functional groups (carboxylic acid vs amine), indicating they are not similar enough to be considered near ideal.

- **Option 3: Chloroform and C2H5-O**: The presence of hydrogen bonding between these two compounds suggests strong interactions that deviate from ideal behavior, placing them in the non-ideal category.

- **Option 4: Water and Nitric Acid**: These two also have different structures and functional groups, leading to non-ideal behavior.

5. **Conclusion**:
- After evaluating the options, we find that n-heptane and n-hexane (Option 1) are the best example of a near ideal solution due to their similar alkane structures.

### Final Answer:
The example of a near ideal solution is **n-heptane and n-hexane**.