1
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
2
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
$$\alpha = {{i - 1} \over {(x + y - 1)}}$$
3
AIEEE 2011
+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
4
AIEEE 2010
+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
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