Question

Which of the following has high osmotic pressure?

• A. Pure water
• B. $1$ M glucose
• C. $1$M NaCl
• D. $1MCaC{l}_2$

Answer 1

Answer: (A)

Pure water

Osmotic pressure denoted by $\pi$

$\pi$=$iCRT$

$C$= concentration

Osomotic pressure only depends upon vant half coefficient, temperature, concentration.

If the temperature is fixed then osmotic pressure depends upon vant half coefficient and concentration.

Pure water has $18$$gm-mo{l}^{-1}$ in one-litre volume.

So concentration of pure water is $18$$mol-li{t}^{-1}$

And vant half coefficient of pure water is $1$

Glucose's vant half coefficient is $1$

So osmotic pressure are in rational $18$:$1$:$2$:$3$