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# Which one of the following pair of solutions are expected to be isotonic at the same temperature?

$\begin{array}{1 1}(a)\;\text{0.1M urea and 0.1M KCl}\\(b)\;\text{0.1M }Ca(NO_3)_2\;\text{and 0.1M}\;K_2SO_4 \\(c)\;\text{0.1M KCl and 0.1M }Na_2SO_4\\(d)\;\text{0.1M urea and 0.2M }MgCl_2\end{array}$

The solutions with same osmotic pressure are called isotonic solution.
$\pi=iCRT$
The compounds with same molarity (C) and same Van't Hoff factors (i) will have same osmotic pressure.
Here $Ca(NO_3)_2$ and $K_2SO_4$ has same molarity(0.1) and same i(3).
Hence (b) is the correct answer.