If O.P. of 1 M of the following in water can be measured, which one will show the maximum O.P. (1) AgNO3 (2) MgCl2 (3) (NH4 )3 P

Answers (1)

Application of Vant Hoff factor -

(a)\: \: \: \left ( \frac{\Delta P}{P^{0}} \right )_{obs}= X_{solute}\times i

(b)\: \: \: \left ( \Delta T_{b} \right )_{obs}= K_{b}\times m\times i

(c)\: \: \: \left ( \Delta T_{f} \right )_{obs}= K_{f}\times m\times i

(d)\: \: \: \left ( \pi \right )_{obs}= C\times R\times T\times i

- (NH4 )3 PO gives maximum ion. Hence, its osmotic pressure is maximum. 

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