JEE CHEMISTRY MCQ: SOLUTIONS

1 Easy

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Understanding +4 | -1

Assertion : One molal aqueous solution of urea contains

60 {~g}

of urea in

1 {~kg}(1000 {~g})

water.

Reason : Solution containing one mole of solute in

1000 {~g}

solvent is called as one molal solution.

View answer and explanation

Correct option: A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

Option A (If both assertion and reason are true and the reason is the correct explanation of the assertion) is correct because the definition of molality is accurately stated, and it directly explains the assertion.

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}.

Assuming

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

and

B

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

A

and 1 mole of

B

was found to be

550 \mathrm{~mm}

\mathrm{Hg}

. The vapour pressure of a solution containing 4 moles of

A

and 1 mole of

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}

glucose per

100 \mathrm{~g}

of water and the other of

3.6 \mathrm{~g}

urea per

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

' is

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

of water

\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.