JEE Questions for Chemistry Solutions Quiz 10 - MCQExams.com

Increasing the temperature of an aqueous solution will cause
  • decrease in molality
  • decrease in molarity
  • decrease in mole fraction
  • decrease in % w/w
Which one of the following salt will have the same value of van’t Hoff factor (i)as that of K4[Fe (CN)6]
  • Al2(SO4)3
  • NaCl
  • Al(NO3)3
  • Na2SO4
The relationship between osmotic pressure at 273 K when 10g glucose (P1), 10 g urea (P2), and 10 g sucrose (P3) are dissolved in 250 ml of water is
  • P1 > P2 > P3
  • P3 > P1 > P2
  • P2 > P1 > P3
  • P2 > P3 > P1
0.1 M NaCl and 0.1 MCH3COOH are kept in separate containers. If their osmotic pressures are P1 and P2 respectively then what is the correct statement?
  • P1 > P2
  • P1 = P2
  • P1 < P2
  • P1 = P2 = 0 atm
Which of the following is not correct for ideal solution?
  • ∆ Smixing = 0
  • ∆ Vmixing = 0
  • ∆ Hmixing = 0
  • It obeys Raoult’s law
Which of the following 0.10 m aqueous solution will have the lowest freezing point?
  • Al2(SO4)3
  • C5H10O5
  • KI
  • C12H22O11
The vapour pressure of a solution (P) and the vapour pressure of the solvent (Po) are related to each other as
  • P = PoX2
  • Po = PX1
  • P = PoX1
  • Po = PX2
Identify the mixture that shows positive deviations from Raoult’s law
  • CHCl3 + (CH3)2CO
  • (CH3)2 CO + C6H5 NH2
  • CHCl3 + C6H6
  • (CH3)2CO + CS2
  • C6H5N + CH3COOH
A Solution contains non-volatile solute of molecular mass M2. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?
(m2 = mass of solute, V = volume of solution, π = osmotic pressure)

  • Chemistry-Solutions-7122.png
  • 2)
    Chemistry-Solutions-7123.png

  • Chemistry-Solutions-7124.png

  • Chemistry-Solutions-7125.png
Formation of a solution from two components can be considered as
(i) pure solvent → separated solvent molecules, ∆H1
(ii) pure solute → separated solute molecules, ∆H2
(iii) separated solvent and solute molecules → solution ∆H3
Solution so formed will be ideal if
  • ΔH soln. = ΔH1 + ΔH2 + ΔH3
  • ΔH soln. = ΔH1 + ΔH2 ‒ ΔH3
  • ΔH soln. = ΔH1 ‒ ΔH2 ‒ ΔH3
  • ΔH soln. = ΔH3 ‒ ΔH1 ‒ ΔH2
A 500 g toothpaste sample has 0.2g fluoride concentration. What is the concentration of fluorine in terms of ppm level?
  • 250
  • 200
  • 400
  • 1000
12g H2SO4 was dissolved in water. The volume of the solution was made 1200 ml. The normality of the solution is
  • 0.05 N
  • 0.102 N
  • 0.112 N
  • 0.204 N
2.5 litre of 1 M NaOH solution are mixed with another 3 litre of 0.5 M NaOH solution. Then the molarity of the resulting solution is
  • 0.80 M
  • 1.0 M
  • 0.73 M
  • 0.50 M
25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was
  • 0.14
  • 0.28
  • 0.35
  • 0.07
Vapour pressure of CCl4 at 25oC is 143 mm Hg. 0.5 g of a non-volatile solute (mol. wt.is dissolved in 100 ml of CCl4. Find the vapour pressure of the solution. (Density of CCl4 = 1.58 g/cm3).
  • 141.93 mm
  • 94.39 mm
  • 199.34 mm
  • 143.99 mm
The vapour pressure of pure A is 10.0 torr and at the same temperature when 1g of B is dissolved in 20g of A, its vapour pressure is reduced to 9.0 torr. If the molecular weight of A is 200 a.m.u., then the molecular weight of B is
  • 100 a.m.u.
  • 90 a.m.u.
  • 75 a.m.u.
  • 120 a.m.u
The vapour pressure of benzene at a certain temp. is 640 mm Hg. A non-volatile-non-electrolyte and weighing 2.175g is added to 39.0g of benzene. The vapour pressure of the solution is 600 mm Hg. What is the molecular weight of the solid substance ?
  • 6.96
  • 65.3
  • 63.8
  • none of the above
The vapour pressure of a solvent decreases by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in vapour pressure is to be 20 mm of mercury ?
  • 0.8
  • 0.6
  • 0.4
  • 0.2
The molal b.p. constant for water is 0.513oC Kg mol-1. When 0.1 mole of sugar is dissolved in 200g of water, the solution boils under a pressure of 1 atm at
  • 100.513oC
  • 100.0513oC
  • 100.256oC
  • 101.025oC
The normal boiling point of water is 373 K (at 760 mm). Vapour pressure of water at 298 K is 23 mm. If enthalpy of vaporisation is 40.656 kJ mol-1, the boiling point of water at 23 mm pressure will be
  • 250 K
  • 294.4 K
  • 51.6 K
  • 12.5 K
The latent heat of vaporisation of water is 9700 cal/mole and if the b.p. is 100oC, the ebullioscopic constant of water is
  • 0.513oC
  • 1.026oC
  • 10.26oC
  • 1.832oC
The freezing point of a 0.05 molal solution of a non-electrolyte in water is
  • ‒1.86oC
  • ‒ 0.93oC
  • ‒ 0.093oC
  • 0.93oC
The freezing point of 0.1 M solution of glucose is -1.86oC. If an equal volume of 0.3 M glucose solution is added, the freezing point of the mixture will be
  • ‒ 7.44oC
  • ‒ 5.58oC
  • ‒ 3.72oC
  • ‒ 2.79oC
In which condition, Henry’s law is applicable ?
  • ideal behaviour of gaseous solute at high pressure and low temperature
  • gaseous solute neither associate nor dissociate in solution
  • gaseous solute react with solvent
  • applicable in given all conditions
The molal elevation constant of water = 0.52oC. The boiling point of 1.0 molal aqueous KCl solution (assuming complete dissociation of KCl), should be
  • 100.52oC
  • 101.04oC
  • 99.48oC
  • 98.96oC
In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking Kf for water as 1.85,the freezing point of the solution will be nearest to
  • ‒0.360oC
  • ‒0.260oC
  • +0.480oC
  • ‒0.480oC
The correct expression relating molality (m), molarity (M), density (d) and molar mass (M2) of solute is

  • Chemistry-Solutions-7142.png
  • 2)
    Chemistry-Solutions-7143.png

  • Chemistry-Solutions-7144.png

  • Chemistry-Solutions-7145.png
The expression relating mole fraction of solute (x2) and molarity (M) of the solution is

  • Chemistry-Solutions-7146.png
  • 2)
    Chemistry-Solutions-7147.png

  • Chemistry-Solutions-7148.png

  • Chemistry-Solutions-7149.png
For a dilute solution containing a nonvolatile solute, which of the following expressions correctly represents the molar mass of solute?

  • Chemistry-Solutions-7150.png
  • 2)
    Chemistry-Solutions-7151.png

  • Chemistry-Solutions-7152.png

  • Chemistry-Solutions-7153.png
Which of the following plots correctly represents the behaviour of an ideal binary liquid solution?
  • Plot of xA (mole fraction of A in liquid phase) versus yA (mole fraction of A in vapour phase) is linear
  • Plot of xA versus yB is linear
  • Plot of 1/xA versus 1/yA is linear
  • Plot of 1/xA versus 1/yB is linear
0:0:1


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