Solution A, B, C and D are respectively 0.1 M glucose, 0.05 M NaCl, 0.05 `MBaCl_(2)` and 0.1 M `AlCl_(3).` Which one of the following paris is istonic ?

Options

A. A and B
B. B and C
C. A and D
D. A and C

Explanation

To determine which pairs of solutions are isotonic, we need to calculate the effective concentration of solute particles in each solution. This is done using the van 't Hoff factor (i), which accounts for the number of particles into which a solute dissociates in solution.

### Step-by-Step Solution:

1. **Identify the Solutions and Their Concentrations:**
- Solution A: 0.1 M glucose (C₆H₁₂O₆)
- Solution B: 0.05 M NaCl
- Solution C: 0.05 M BaCl₂
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