ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 6

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IMPORTANT

Earn 100

If the molality of an aqueous solution of cane sugar is $0.4445$ , what is the mole fraction of cane sugar?

Important Questions on Solutions

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 6

Albumins are the most abundant proteins in blood. At

25 ° C

,

3.5 g

of albumin in

100 mL

of water produces an osmotic pressure of

0.014 atm

. What is the molecular weight of albumin?

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 7

The boiling point of pure water is

373 K

. Calculate the boiling point of an aqueous solution containing

18 gms

of glucose (MW

= 180

) in

100 gms

of water. Molal elevation constant of water is

0.52 K \cdot Kg \cdot {mol}^{- 1}

.

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 7

Equal weights of two substances X and Y are dissolved in equal volumes of water. The osmotic pressure of the solution containing Y is five times the osmotic pressure of the solution containing X. What is the molecular weight of X if that of Y is

60

?

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 7

Which of the following solutions will have a lower vapour pressure and why?
(i) A

5 %

solution of cane sugar (

C_{12} H_{22} O_{11}

)
(ii) A

5 %

solution of urea (

{NH}_{2} {CONH}_{2}

)

(Relative atomic masses of $H = 1, C = 12, O = 16, N = 14$ )

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ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 8

Out of the following solutions, the one having the highest boiling point will be

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 8

0.1 M

urea solution shows less depression in freezing point than

0.1 M

{MgCl}_{2}

solution. Explain.

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IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 9

46 gms

of ethyl alcohol is dissolved in

18 g

of water. Calculate the mole fraction of ethyl alcohol. (at. wt. of

C = 12, O = 16, H = 1

).

HARD

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>QUESTIONS FROM ISC EXAMINATION PAPERS>Q 9

The osmotic pressure of

0.01

molar solution of an electrolyte is found to be

0.65 atm .

at

27 ° C

. Calculate the van’t Hoff factor. What conclusion can you draw about the molecular state of the solute in the solution?