Question

What would be the per cent strength of the solution of urea that would be isotonic with $4.5$% solution of glucose?

• A. $4.5$%
• B. $13.5$%
• C. $1.5$%
• D. $9$%

Answer 1

The correct option is C $1.5$%

Osmotic pressure $=\pi =c\times R\times T$.

Since the osmotic pressure for both the glucose and urea solution is equal,

$C\left(urea\right)=C\left(glucose\right)$

$\frac{4.5}{180}=\frac{x}{60}$

$\therefore x=1.5$%

Hence, option C is correct.