Which of the following pair of solutions is isotonic? A. 18 ~g / L of glucose of solution and 6 ~g / L of Urea solution B. 10 ~g / L of glucose solution and 10 ~g / L of Urea solution C. 0.01 M NaOH solution and 0.02 M glucose solution D. 0.01 M NaCl solution and 0.01 M glucose solution (Assume that NaCl undergoes complete dissociation)

Step-by-step solution

Osmotic pressure = CRT ; C is in moles/L. C = n V = m MV m = mass of solute and M = mol . wt. of solute V = Volume in L . At a given T , isotonic solution; ₁= ₂ ; C ₁ RT = C ₂ RT (A) 18 ~g / L of glucose =(18 / 180) / L =0.1 ~mol / L =0.1( M ) and 6 ~g / L of Urea =(6 / 60) / L =0.1 ~mol / L =0.1( M ) (B.) 10 ~g / L of glucose = ( 10 180 ) / L =(1 / 18) / L =0.06( M )10 ~g / L of urea = ( 10 60 ) / L =(1 / 6) / L =0.17( M ) C ₁ C ₂ (C) 0.01( M ) NaOH solution and 0.02( M ) glucose solution are isotonic. aligned & _