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Van't Hoff Factor

At same tempe...

Question

At same temperature which pair of the following solutions are isotonic?

0.2 M

B a C l_{2}

and

0.2 M

urea

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0.1 M

urea and

0.1 M

NaCl

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0.1 M

NaCl and

0.1 M

K_{2} S O_{4}

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0.1 M

B a (N O_{3})_{2}

and

0.1 M

N a_{2} S O_{4}

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Solution

The correct option is D $0.1 M$ $B a (N O_{3})_{2}$ and $0.1 M$ $N a_{2} S O_{4}$
Isotonic solutions have the same osmotic pressure and same molar concentration.

The solution of $0.1 M$ $B a (N O_{3})_{2}$ and $0.1 M$ $N a_{2} S O_{4}$ are isotonic.

The osmotic pressure of $0.1 M$ $B a (N O_{3})_{2}$

$= i M R T = 3 \times 0.1 R T = 0.3 R T$

Osmotic pressure of $0.1$ M $N a_{2} S O_{4}$

$= i M R T = 3 \times 0.1 R T = 0.3 R T$

The correct answer is "The solution of $0.1 M$ $B a (N O_{3})_{2}$ and $0.1 M$ $N a_{2} S O_{4}$ are isotonic".

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