Single Choice

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

Aboiling boiling of ethanoic acid become half of normal value
Bfreezing point of ethanoic acid become twice of normal value
Cmolar mass become twice of normal value
Correct Answer
Dvapour pressure of solution decreases due to dimerisation

Solution

As molecules of ethanoic acid dime rises in benzene due to the $$H-$$bonding its molar mass becomes twice of normal value.

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

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

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

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Solutions

Acetic acid dissolved in benzene shows a molecular weight of:

Solutions

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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:

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