Which of the following combinations are correct for a binary solution, in which the solute as well as solvent are liquid?

Options

A. `C_(6)H_(6) and C_(6)H_(5)CH(3)`,`Delta_(sol)Hgt0`,`Delta_(sol)V=0`
B. `CH_(3)-overset(O)overset(||)(C)-CH_(3)` and `CHCl_(3)`,`Delta_(sol)H lt O`,`Delta_(sol)V lt O`
C. `H_(2)O` and `HCl`,`Delta_(sol)H lt O`,`Delta_(sol)V lt O`
D. `H_(2)O` and `CH_(2)OH`,`Delta_(sol)H lt O`,`Delta_(sol)V lt O`

Answer

To solve the question regarding the correct combinations for a binary solution where both the solute and solvent are liquids, we will analyze the given combinations based on their behavior in terms of ideal and non-ideal solutions.

### Step-by-step Solution:

1. **Identify the Combinations**:
We need to evaluate the following combinations:
- A: Benzene (C6H6) and Toluene
- B: Acetone and Chloroform
- C: Water (H2O) and Hydrochloric Acid (HCl)
- D: Water (H2O) and Methanol

2. **Analyze Combination A (Benzene and Toluene)**:
- Benzene and Toluene form an ideal solution.
- In an ideal solution, the change in enthalpy (ΔH) and the change in volume (ΔV) of the mixture are both zero.
- Therefore, this combination is **incorrect** for a binary solution because it does not show a deviation.

3. **Analyze Combination B (Acetone and Chloroform)**:
- Acetone and Chloroform exhibit a negative deviation from Raoult's law.
- For solutions showing negative deviation, both ΔH and ΔV are negative.
- Thus, this combination is **correct**.

4. **Analyze Combination C (Water and Hydrochloric Acid)**:
- Water and HCl also show a negative deviation from Raoult's law.
- Similar to the previous case, both ΔH and ΔV are negative.
- Therefore, this combination is **correct**.

5. **Analyze Combination D (Water and Methanol)**:
- Water and Methanol exhibit a positive deviation from Raoult's law.
- In this case, both ΔH and ΔV are positive.
- Hence, this combination is **incorrect**.

6. **Conclusion**:
- The correct combinations for a binary solution where both solute and solvent are liquids are:
- B: Acetone and Chloroform
- C: Water and Hydrochloric Acid

### Final Answer:
The correct combinations are B and C.

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