Which of the following statements is NOT true about 0.05 M urea...

Osmotic pressure is given by $\pi = iCRT$.

For urea and glucose, the van't Hoff factor $i = 1$.

For $0.05$ M urea solution, $\pi_{urea} = 0.05 RT$.

For $0.1$ M glucose solution, $\pi_{glucose} = 0.1 RT$.

Since $\pi_{glucose} > \pi_{urea}$, the glucose solution has a higher osmotic pressure and is hypertonic to the urea solution. The urea solution is hypotonic to the glucose solution.

Since their osmotic pressures are different, they are not isotonic solutions.

Answer: These two solutions are isotonic solutions.