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Which of the following pairs of solution are isotonic at the same temperature?
(a) \( 0.1 \mathrm{M} \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} \) and \( 0.1 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(b) \( 0.1 \mathrm{M} \mathrm{NaCl} \) and \( 0.1 \mathrm{M} \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(c) \( 0.1 \mathrm{M} \) urea and \( 0.1 \mathrm{M} \mathrm{MgCl}_{2} \)
(d) \( 0.2 \mathrm{M} \) urea and \( 0.1 \mathrm{M} \mathrm{NaCl} \)
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