Which one of the following pairs of solution can we except to be isotonic at the same temperatur....

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Which one of the following pairs of solution can we
\( \mathrm{P} \)
except to be isotonic at the same temperature?
(1) \( 0.1 \mathrm{M} \) urea and \( 0.1 \mathrm{M} \mathrm{NaCl} \)
(2) \( 0.1 \mathrm{M} \) urea and \( 0.2 \mathrm{M} \mathrm{MgCl}_{2} \)
(3) \( 0.1 \mathrm{M} \mathrm{NaCl} \) and \( 0.1 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(4) \( 0.1 \mathrm{M} \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} \) and \( 0.1 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4} \)


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