1
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
Consider separate solutions of 0.500 M C2H5OH(aq), 0.100 M Mg3(PO4)2(aq), 0.250 M KBr(aq) and 0.125 M Na3PO4(aq) at 25oC. Which statement is true about these solutions, assuming all salts to be strong electrolytes?
A
0.125 M Na3PO4(aq) has the highest osmotic pressure.
B
0.500 M C2H5OH(aq) has the highest osmotic pressure
C
They all have the same osmotic pressure
D
0.100 M Mg3(PO4)2(aq) has the highest osmotic pressure.
2
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Kf for water is 1.86K kg mol–1. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2H6O2) must you add to get the freezing point of the solution lowered to –2.8oC ?
A
72 g
B
93 g
C
39 g
D
27 g
3
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
The degree of dissociation ($$\alpha$$ ) of a weak electrolyte, AxBy is related to van’t Hoff factor (i) by the expression :
A
$$\alpha = {{i - 1} \over {x + y + 1}}$$
B
$$\alpha = {{x + y - 1} \over {i - 1}}$$
C
$$\alpha = {{x + y + 1} \over {i - 1}}$$
D
$$\alpha = {{i - 1} \over {(x + y - 1)}}$$
4
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at −6oC will be : [Kf for water = 1.86 K kg mol−1 , and molar mass of ethylene glycol = 62 g mol−1 )
A
204.30 g
B
400.00 g
C
304.60 g
D
804.32 g
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