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Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/ are _____ A. 1 M aq . NaCl and 2 M aq . urea B. 1 M aq . CaCl 2 and 1 . 5 M aq . KCl C. 1 . 5 M aq . AlCl 3 and 2 M aq . Na 2 SO 4 D. 2 . 5 M aq . KCl and 1 M aq . Al 2 ( SO 4 ) 3

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A solution having the same solute and solvent concentration as a cell across the semipermeable membrane is referred to as isotonic solution. The effective concentration of each solution can be calculated as follows, Effective concentration = i ( Von ' t   Hoff   factor ) × C 1 M   NaCl has effective concentration = 2 × 1 = 2 M and hence it is isotonic with two molar urea solution. 1 M   CaCl 2 has effective concentration =   3 M   and   1 . 5 M   KCl has also 3

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