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Sulphuric Acid

1) in gaseous...

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1) in gaseous phase the vapour pressure of acetic acid is less than expected 2) in benzene acetic acid dimerises 3)methanol is more viscous than water 4)CH3OCH3 is non-polar but soluble in water which of the following statements is true and fals

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Acetic acid undergoes dimerisation, when dissolved in benzene (as shown in figure)
Molecular mass of acetic acid is found to be

120

Which among the following relation is correct?

α

= degree of association,

d

= observed vapour density,

D

= Theoretical vapour density).

Q. Acetic acid dimerises in vapour phase at

437 K

2 C H_{3} C O O H (g) ⇌ {(C H_{3} C O O H)}_{2} (g)

0.0519 g

of acetic acid was found to have

764.3 m m

437 K

in a container of

21.45 {c m}^{3}

. Calculate degree of dimerisation for acetic acid dimerisation.

C H_{3} C O O H

is added in 250 g benzene. Acetic acid dimerises in benzene due to hydrogen bond.

K_{b}

of benzene is 2 K

k g m o l^{- 1}

. The boiling point has increased by 6.4 K. % dimerisation of acetic acid is :

Q. Assertion :The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different. Reason: Water is polar and benzene is non-polar.

Q. Consider the following statements and arrange in the order of true/false as given in the codes.

S_{1}

: Vapour pressure is a colligative property.

S_{2}

: Freezing point of a solution is always lower than that of the pure solvent.

S_{3}

: Acetic acid undergoes association in benzene. The molar mass of acetic acid, determined by elevation of boiling point is always higher than its normal molar mass.

S_{4}

: Osmotic pressure measurements can be used for determination of molar mass of polymers.

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