Which one of the following pairs of solution can we expect to be isotonic at the same
temperature.
A. 0.1M urea and 0.1M NaCl
B. 0.1M urea and 0.2M MgCl₂
C. 0.1M NaCl and 0.1M Na₂SO₃
D. 0.1M Ca(NO3)2 and 0.1M Na₂SO₃