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Question

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
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B
0.1M urea and 0.2M MgCl2
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C
0.1M NaCl and 0.1M Na2SO3
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D
0.1M Ca(NO3)2 and 0.1M Na2SO3
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Solution

The correct option is D $$0.1 M$$ $$Ca(NO_3)_2$$ and $$0.1 M$$ $$Na_2SO_3$$
Isotonic or iso-osmotic solution : Solutions which have the same osmotic pressure are termed isotonic or iso-osmotic solutions
So solution with equal molar conc. are isotonic.
0.1 M $$Ca(NO_3)_2$$ and 0.1 M $$Na_2SO_3$$ are isotonic as both gives 3 ions with equal concentrations.

Chemistry

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