Which of the following solution is isotonic with $0.1$ M aqueous solution of urea?

0.05 M N a C l

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0.1 M N a C l

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0.025 M N a C l

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1 M N a C l

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Solution

The correct option is A $0.05 M N a C l$
$0.1$ M urea solution is isotonic with $0.05$ M $N a C l$ solution. Both solutions will give the same number of particles per unit volume of solution. Urea is non-electrolyte and doesn't dissociate in solution. $N a C l$ is a strong electrolyte. One $N a C l$ molecule dissociates to give two ions. Thus for both solutions the product, $i \times m$ is the same which is $0.1$

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0.1M of urea is isotonic to

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$0.06 %$ (w/v)aqueous solution of urea is isotonic with:

6

= 60 g m {m o l}^{- 1}

0.06

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