Three boxes of equal volume each contain an aqueous solution, but the solutes differ.
• Box P: 4 formula units of NaCl (completely dissociates into Na⁺ and Cl⁻ ions)
• Box Q: 7 molecules of urea, CO(NH₂)₂ (does not dissociate)
• Box R: 3 formula units of CaCl₂ (completely dissociates into Ca²⁺ and Cl⁻ ions)
Ignoring solvent molecules, which box has the highest concentration of dissolved particles?
a) Box P
b) Box R
c) Box Q
d) Boxes P and R are tied