Single Choice

The molecular weight of benzoic acid in benzene as determined by depression in the freezing point method corresponds to:

Aionization of benzoic acid
Bdimerization of benzoic acid
Correct Answer
Ctrimerization of benzoic acid
Dsolvation of benzoic acid

Solution

The molecular weight of benzoic acid in benzene is determined by the depression in freezing point method and comes out to be $$244$$. The actual molecular mass is $$122$$. Therefore, it corresponds to the dimers which are formed by hydrogen bonding.

SIMILAR QUESTIONS

Solutions

A compound $$MX_{2}$$ has observed and normal molar masses 65.6 and 164 respectively. The apparent degree of ionization of $$MX_{2}$$ is:

Solutions

A weak electrolyte $$(AB_2)$$ with formula mass 100 g / mole is dissociated in water upto 50%. The observed molar mass of the electrolyte is:

Solutions

0.0852 g of an organic halide (A) when dissolved in 2.0 g of camphor, the melting point of the mixture was found to be $$167^{\circ}$$C. Compound (A) when heated with sodium gives a gas (B). 280 mL of gas (B) at STP weighs 0.375g. What would be 'A' in the whole process? $$K_f$$ for camphor = 40, m.pt. of camphor = $$179^{\circ}$$C.

Solutions

When a liquid that is immiscible with water was steam distilled at $${\text{95}}{\text{.}}{{\text{2}}^{\text{o}}}{\text{C}}$$ at a total pressure of 748 torr, the distillate contained 1.25 g of the liquid per gram of water. The vapour pressure of water is 648 torr at $${\text{95}}{\text{.}}{{\text{2}}^{\text{o}}}{\text{C}}$$, What is the molar mass of liquid?

Solutions

Acetic acid dissolved in benzene shows a molecular weight of:

Solutions

Benzoic acid dissolved in benzene will show a molecular mass of:

Solutions

Boiling point of chloroform was raised by $$0.323 K$$, when $$0.5143 g$$ of anthracene was dissolved in $$35 g$$ of chloroform. Molecular mass of anthracene is $$\left( {{K_b}\,for\,CHC{l_3} = 3.9\,K\,\,kg\,mo{l^{ - 1}}} \right)$$

Solutions

If the observed and theoretical molecular mass of NaCl is found to be 31.80 and 58.50, then the degree of dissociation of NaCl is:

Solutions

Molecules of ethanoic acid dimerises in benzene due to $$H-$$bonding if all molecules of ethanoic acid associated in benzene then:

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