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Solutions · Question 23

NEET 2016 (Phase 2)MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(4) 3

Solution

Barium hydroxide is a strong electrolyte and dissociates completely in dilute solution:

Ba(OH)2 Ba2+ + 2OH-

1 formula unit gives 3 ions

i = 3

Answer: (4)

NEET 2016 (Phase 2)

Keep practising — Solutions

2

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)
3

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
4

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)
5

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)
6

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)
7

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
8

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)
9

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)
10

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)
11

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86 C/m, the freezing point of the solution will be

  1. -0.18 C
  2. -0.54 C
  3. -0.36 C
  4. -0.24 C
AIPMT 2011 (Mains)

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