Question

Arrange the following solutions in increasing order of their osmotic pressures.
(i) $34.2g/$ litre sucrose
(ii) $60g/$ litre of urea
(iii) $90g/$ litre of glucose
(iv) $58.5g/litre$ of sodium chloride

• A. (i)<(iii)<(ii)<(iv)
• B. (iii)<(i)<(iv)<(ii)
• C. (i)<(iii)<(iv)<(ii)
• D. (ii)<(iv)<(i)<(iii)

Answer 1

Answer: (A)

	Sucrose	Urea	Glucose	$NaCl$
Strength $(g{L}^{-1})$ :	$34.2$	$60$	$90$	$90$
Molarity :	$\frac{34.2}{342}=0.1$	$\frac{60}{60}=1$	$\frac{90}{180}=0.5$	$\frac{58.5}{58.5}=1$
$i$ :	$1$	$1$	$1$	$2$

We know, $\pi t=iCRT$
Thus, Osmotic pressure of these solutions will lie in following sequence :