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JEE CHEMISTRY MCQ: SOLUTIONS

1 Hard

1 of 1

Application +4 | -1

The lowering in vapour pressure caused by the addition of

100 \mathrm{~g}

of sucrose (molecular mass

=342

) to

1000 \mathrm{~g}

of lowering in water, if the vapour pressure of pure water at

25^{\circ} \mathrm{C}

is

23.8 \mathrm{~mm} \mathrm{~Hg}

, is

View answer and explanation

Correct option: B

0.125 \mathrm{~mm} \mathrm{~Hg}

Option B (0.125 mm Hg) is correct because it is calculated using Raoult's law for vapor pressure lowering.

More Questions from SOLUTIONS

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An aqueous solution of a solute which neither associates nor dissociates has a freezing point depression of

\mathrm{X}^{\circ} \mathrm{C}.

An equimolal solution of a second salt has a freezing point depression of

3 \mathrm{X}^{\circ} \mathrm{C}.

100 \%

dissociation of salt, the second solution could be a salt of formula Read the following statements carefully and choose the correct option

(i) Osmotic pressure is not a colligative property.

(ii) For dilute solutions, osmotic pressure is proportional to the molarity,

{C}

of the solution at a given temperature

T

.

(iii) During osmosis, solvent molecules always flow from higher concentration to lower concentration of solution.

(iv) The osmotic pressure has been found to depend on the concentration of the solution A solution that obeys Raoult’s law is called When two liquids

A

B

are mixed they form an ideal solution. At certain temperature the V.P. of the solution, that contains 3 moles of

A

B

was found to be

550 \mathrm{~mm}

\mathrm{Hg}

. The vapour pressure of a solution containing 4 moles of

A

B

was found to be 560

\mathrm{mm}

\mathrm{Hg}

. The vapour pressure of pure liquid

A

is Equal masses of two aqueous solutions, one of

3.6 \, \mathrm{g}

100 \mathrm{~g}

of water and the other of

3.6 \mathrm{~g}

100 \mathrm{~g}

of water are mixed. If the freezing point of resulting solution is

-x^{\circ} \mathrm{C},

then the value of '

1000 x

\left(K_{\mathrm{f}}\right.

\left.=1.86\right)

Information

I. Semipermeable membrane contains network of submacroscopic holes or pores.

II. Semipermeable membrane appears to be continuous sheets or films.

III. Solvent molecules cannot pass through the holes of semipermeable membrane but solute molecules can pass On the basis of the information given above select the correct option.