Which one of the following pairs of solutions | vedclass

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(D) Two solutions are isotonic if they have the same osmotic pressure $(\pi = iCRT)$. Since the temperature $(T)$ and concentration $(C)$ are the same

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$0.1 \ M \ Ca(NO_3)_2$ and $0.1 \ M \ Na_2SO_4$

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(D) Two solutions are isotonic if they have the same osmotic pressure $(\pi = iCRT)$. Since the temperature $(T)$ and concentration $(C)$ are the same,the van't Hoff factor $(i)$ must be equal for the solutions to be isotonic.For $0.1 \ M \ Ca(NO_3)_2$: $i = 3$ $(Ca^{2+} + 2NO_3^-)$,so effective concentration = $0.1 	imes 3 = 0.3 \ M$.For $0.1 \ M \ Na_2SO_4$: $i = 3$ $(2Na^{+} + SO_4^{2-})$,so effective concentration = $0.1 	imes 3 = 0.3 \ M$.Since both have the same effective concentration of particles,they are isotonic.

Which one of the following pairs of solutions can we expect to be isotonic at the same temperature?

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