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NEET UG CHEMISTRY MCQ: SOLUTIONS

1 Hard

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Analyzing +4 | -1

A current of dry air was passed through a series of bulbs containing

1.25 \mathrm{~g}

of a solute

\mathrm{A}_2 \mathrm{B}

(molar mass

=90 \mathrm{~g} / \mathrm{mol}

) in

49 \mathrm{~g}

of water and then through pure water. The loss in weight of the former series of bulbs was

0.98 \mathrm{~g}

and in the later series

0.01 \mathrm{~g}.

The percentage dissociation of solute is

View answer and explanation

Correct option: A

50 \%

Option A (50 %) is correct because the percentage dissociation is calculated by comparing the observed and theoretical colligative properties.

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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

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

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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}

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