Solutions $A, B, C$ and $D$ are respectively $0.1 M$ glucose, $0.05 M N a C l, 0.05 M B a {C l}_{2}$ and $0.1 M A l {C l}_{3}$ . Which one of the following pairs is isotonic?

A

and

B

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B

and

C

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A

and

D

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A

and

C

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Solution

The correct option is A $A$ and $B$
Isotonic solutions have same molar concentration of solute particles in solution. Molar concentration of particles in solution are $0.1 M$ in glucose, $2 \times 0.05 M$ in $N a C l, 3 \times 0.05$ in $B a {C l}_{2}$ and $4 \times 0.1$ in $A l {C l}_{3}$ . Therefore, $0.1 M$ glucose and $0.05 M N a C l$ solutions are isotonic.

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