\(^{\pi} C_{2} H_{3} O H\) \(=1 \times 0.500 \times R \times T=0.5 R T\)
\(^{\pi} M g_{3}\left(P O_{4}\right)_{2}\) \(=5 \times 0.100 \times R \times T=0.5 R T\)
\(^{\pi} K B r=2 \times 0.250 \times R \times T=0.5 R T\)
\(^{\pi} N a_{3} P O_{4}=4 \times 0.125 \times R T=0.5 R T\)
since the osmotic pressure of all the given solutions is equal.
Hence all are isotonic solution.
[ $\mathrm{AB}_2$ નું મોલર દળ $=200 \mathrm{~g} \mathrm{~mol}{ }^{-1}$, પાણીનું ઉત્કલનબિંદુ $=100^{\circ} \mathrm{C}, \mathrm{K}_{\mathrm{b}}$ (પાણીનો મોલલ ઉત્કલનબિંદુ ઉન્નયન અચળાંક $\left.=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)$ ]