1
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (∆Tf), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kg mol–1)
A
0.0372 K
B
0.0558 K
C
0.0744 K
D
0.0186 K
2
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components (heptane and octane) are 105 kPa and 45 kPa respectively. Vapour pressure of the solution obtained by mixing 25.0g of heptane and 35 g of octane will be (molar mass of heptane = 100 g mol–1 and of octane = 114 g mol–1)
A
72.0 kPa
B
36.1 kPa
C
96.2 kPa
D
144.5 kPa
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?
A
The solution formed is an ideal solution
B
The solution is non-ideal, showing +ve deviation from Raoult’s law.
C
The solution is non-ideal, showing –ve deviation from Raoult’s law.
D
n-heptane shows +ve deviation while ethanol shows –ve deviation from Raoult’s law.
4
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Two liquids X and Y form an ideal solution. At 300K, vapour pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively :
A
200 and 300
B
300 and 400
C
400 and 600
D
500 and 600
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