1
JEE Main 2015 (Offline)
+4
-1
The vapour pressure of acetone at 20oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20oC, its vapour pressure was 183 torr. The molar mass (g mol-1) of the substance is:
A
64
B
128
C
488
D
32
2
JEE Main 2014 (Offline)
+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.
3
AIEEE 2012
+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
4
AIEEE 2011
+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
$$\alpha = {{i - 1} \over {(x + y - 1)}}$$
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