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Solutions · Question 22

NEET 2016 (Phase 1)MCQMedium📈 Topic in 12% papers+4−1
1

At 100 the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be

  1. 102
  2. 103
  3. 101
  4. 100

Answer

(3) 101

Solution

At 100 , vapour pressure of pure water p = 760 mm, ps = 732 mm.

Relative lowering of vapour pressure:

p - psps = n2n1

n2n1 = 760 - 732732 = 28732 = 0.0383

Molality (moles of solute per 1000 g water, n1 = 100018):

m = 0.0383 100018 = 2.13 mol kg-1

Tb = Kb m = 0.52 2.13 = 1.1 K

∴ Tb = 100 + 1.1 = 101.1 101

Answer: (3)

NEET 2016 (Phase 1)

Keep practising — Solutions

2

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

  1. 0
  2. 1
  3. 2
  4. 3
NEET 2016 (Phase 2)
3

Which one of the following is incorrect for ideal solution?

  1. Hmix = 0
  2. Umix = 0
  3. P = Pobs - Pcalculated by Raoult's law = 0
  4. Gmix = 0
NEET 2016 (Phase 2)
4

What is the mole fraction of the solute in a 1.00 m aqueous solution?

  1. 1.770
  2. 0.0354
  3. 0.0177
  4. 0.177
AIPMT 2015
5

The boiling point of 0.2 mol kg-1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

  1. Molecular mass of X is less than the molecular mass of Y.
  2. Y is undergoing dissociation in water while X undergoes no change.
  3. X is undergoing dissociation in water.
  4. Molecular mass of X is greater than the molecular mass of Y.
AIPMT 2015 (Cancelled)
6

Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al2(SO4)3 (if all are 100% ionised)?

  1. Al(NO3)3
  2. K4[Fe(CN)6]
  3. K2SO4
  4. K3[Fe(CN)6]
AIPMT 2015 (Cancelled)
7

Which of them is not equal to zero for an ideal solution?

  1. Vmix
  2. P = Pobserved - PRaoult
  3. Hmix
  4. Smix
AIPMT 2015 (Cancelled)
8

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

  1. KCl
  2. C6H12O6
  3. Al2(SO4)3
  4. K2SO4
AIPMT 2014
9

Which condition is not satisfied by an ideal solution?

  1. mixV = 0
  2. mixS = 0
  3. Obeyance to Raoult's Law
  4. mixH = 0
NEET 2013 (Karnataka)
10

Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25 are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at the same temperature will be (Molecular mass of CHCl3 = 119.5 u and molecular mass of CH2Cl2 = 85 u)

  1. 173.9 mm Hg
  2. 615.0 mm Hg
  3. 90.6 mm Hg
  4. 285.5 mm Hg
AIPMT 2012 (Mains)
11

pA and pB are the vapour pressures of pure liquid components, A and B, respectively of an ideal binary solution. If xA represents the mole fraction of component A, the total pressure of the solution will be

  1. pA + xA (pB - pA )
  2. pA + xA (pA - pB )
  3. pB + xA (pB - pA )
  4. pB + xA (pA - pB )
AIPMT 2012 (Prelims)

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