Consider the following aqueous solutions and assume 100% ionisation in electrolytes I. 0.1 m urea II. 0.04 m ${\rm{A}}{{\rm{l}}_2}{\left( {{\rm{S}}{{\rm{O}}_4}} \right)_3}$ III. 0.05 m ${\rm{CaC}}{{\rm{l}}_2}$ IV. 0.005 m NaCl The correct statement regarding the above solution is

Freezing point will be lowest for solution I

Boiling point will be highest for solution IV

Vapour pressure will be highest for solution II

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NEET UG CHEMISTRY MCQ: SOLUTIONS

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Consider the following aqueous solutions and assume 100% ionisation in electrolytes

I. 0.1 m urea

II. 0.04 m

\mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3}

III. 0.05 m

\mathrm{CaC}{\mathrm{l}_2}

IV. 0.005 m NaCl

The correct statement regarding the above solution is

View answer and explanation

Correct option: B

Freezing point will be highest for solution IV

Option B (Freezing point will be highest for solution IV) is correct because the solution with the lowest total molality of ions will have the highest freezing point.

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Consider the solution of ethanol. In it Assertion: Isotonic solutions don't show net phenomenon of osmosis.

Reason: Isotonic solutions have equal osmotic pressure at constant temperature. 0.2 molal aqueous solution of a monobasic acid is 60% ionised. If Kb for water is

0.52\,K\,kg\,mo{l^{ - 1}}

then the boiling point of the solution will be The vapour pressures of pure liquids

A

and

B

are 400 and 600 mmHg, respectively at 298 K. On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid

B

is 0.5 in the mixture. The vapour pressure of the final solution, the mole fractions of components

A

and

B

in vapour phase, respectively are What is molecular weight of a substance whose 7.0% by mass solution in water freezes at

--{0.93^0}C

{K_f}

for water is

1.86\mathrm{ }K\mathrm{ }kg\mathrm{ }mo{l^{ - 1}}

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. the vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be