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(D) Two solutions are isotonic if their osmotic pressures are equal at the same temperature. Osmotic pressure $\pi = iCRT$,where $i$ is the van't Hoff

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$0.1 \ M$ $BaCl_2$ and $0.075 \ M$ $FeCl_3$

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(D) Two solutions are isotonic if their osmotic pressures are equal at the same temperature. Osmotic pressure $\pi = iCRT$,where $i$ is the van't Hoff factor,$C$ is the molarity,$R$ is the gas constant,and $T$ is the temperature. For isotonic solutions,$i_1C_1 = i_2C_2$.For option $D$:For $0.1 \ M$ $BaCl_2$,$i = 3$ (as $BaCl_2 ightarrow Ba^{2+} + 2Cl^-$),so $iC = 3 	imes 0.1 = 0.3 \ M$.For $0.075 \ M$ $FeCl_3$,$i = 4$ (as $FeCl_3 ightarrow Fe^{3+} + 3Cl^-$),so $iC = 4 	imes 0.075 = 0.3 \ M$.Since $i_1C_1 = i_2C_2$,these solutions are isotonic.

Which of the following pairs of solutions are expected to be isotonic,temperature being the same?

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