Question

The osmotic pressure of equimolar solutions of a) $A{l}_2(S{O}_4{)}_3$, b) $KCl$ and c) $sugar$ will be:

• A. $b>a>c$
• B. $a>b>c$
• C. $c>b>a$
• D. $b>c>a$

Answer 1

The correct option is B $a>b>c$

Solution:-

As we now that osmotic pressure is given as-

$\pi =iCRT$

As ${}^{\prime }{i}^{\prime }$ increases, $\text{'}\pi \text{'}$ also increases.

$i=5$ for ${Al}_2{\left(S{O}_4\right)}_3$

$i=2$ for $KCl$

$i=1$ for glucose

Therefore, osmotic pressure of given solutions will be in order-

$\left(a\right)>\left(b\right)>\left(c\right)$