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. CaCl2 and 1.5 M aq. KCl
C. 1.5 M aq. AlCl3 and 2 M aq. Na2SO4
D. 2.5 M aq. KCl and 1 M aq. Al2(SO4)3

Answer:4
Explanation:

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