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Q1. A 0.0020 m aqueous solution of an ionic compound Co(NH_3 )_5 (NO_2 )Cl freezes at -0.00732 ͦC. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be : (K_f= +1.86°C/m)
•  1
•  3
•  4
•  2
Solution

Q2.The relative lowering of vapour pressure produced by dissolving 71.5 g of a substance in 1000 g of water is 0.00713. The molecular weight of the substance will be :
•  18.0
•  180
•  342
•  60
Solution

Q3.  6.02×〖10〗^20molecules of urea are present in 100 mL of its solution. The concentration of urea solution is
•  &nbsp0.1 M
•  0.02 M
•  0.001 M
•  0.01 M
Solution

Q4. The number of moles of a solute in its solution is 20 and total number of moles are 80. The mole fraction of solute is
•  1.25
•  1.00
•  0.50
•  0.25
Solution
D

Q5.On shaking 10 mL of 0.1 molar solution of an organic compound in water with 10 mL of CCl_4 til equilibrium is attained, concentration of the organic compound in water would be (K=9) in molar units :
•  0.01
•  0.09
•  0.001
•  0.009
Solution

Q6. Equimolar solutions of two non-electrolytes in the same solvent should have :
•  Same b. p but different f. P
•  Same b. p. and same f. p.
• Same f. p. but different b. p.
•  Different b. p. and different f. p.
Solution

Q7.A solution of sulphuric acid in water exhibits :
•  The applicability of Henry’s law
•  Ideal properties
•  Negative deviations from Raoult’s law
•  Positive deviations from Raoult’s law
Solution

Q8.The vapour pressure of water depends upon :
•  Surface area of container
•  Temperature
•  Volume of container
•  All of these
Solution
Vapour pressure is independent of surface area and volume of container

Q9.The degree of dissociation (Î±) of a weak electrolyte , A_x B_y is related to van’t Hoff factor (i) by the expression
•  Î±=(x+y+1)/(i-1)
•  Î±=(x+y-1)/(i-1)
•  Î±=(i-1)/(x+y+1)
•  Î±=(i-1)/((x+y-1))
Solution

Q10. The substances whose solubility decreases with increase in temperature :
•  Na_2 SO_4
•  All of these
•  Na_2 CO_3
• Ca(OH)_2
Solution
All get dissolved with evolution of heat.

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