Question

Which of the following solution(s) is/are isotonic with 0.2 M NaCl (u = degree of dissociation) solution at an identical temperature?

a) 0.1 M KCl (u = 1)
b) 0.2 M CaCl₂ (u = 3)
c) 0.3 M MgCl₂ (u = 2)
d) All of the above