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Question

The electrolyte solutions show abnormal colligative properties. To account for this effect we define a quantity called the Van't Hoff factor given by :

     $$i=\displaystyle\frac{\text{Actual number of particles in solution after dissociation/association}}{\text{Number of formula units initially dissolved in solution}}$$

     $$i=1$$ (for non-electrolytes)
     $$i > 1$$ (for non-electrolytes, undergoing dissociation)
     $$i < 1$$ (for solutes, undergoing dissociation)

Answer the following questions:

A solution of benzoic acid is dissolved in benzene such that it undergoes molecular association and its molar mass approaches 244. The benzoic molecules will exist as :


A
Dimer
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B
Monomer
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C
Tetramer
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D
Trimer
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Solution

The correct option is C Dimer
Molecular formula of benzoic acid $$=C_6H_5COOH$$

Molecular mass of benzoic acid $$=122$$

Molecular mass of benzoic acid in the solution $$=244$$

Let, 
Molecular formula of benzoic acid in the solution $$=(C_6H_5COOH)_n$$

Now,
$$n=\dfrac{M_{(C_6H_5COOH)_n}}{M_{C_6H_5COOH}}=\dfrac{244}{122}=2$$

Therefore, benzoic acid in the solution exist as dimer.

Chemistry
NCERT
Standard XII

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