1
JEE Advanced 2016 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-1

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl, CH3OH and CH3(CH2)11 OSO$$_3^ - $$ Na+ at room temperature. The correct assignment of the sketches is

JEE Advanced 2016 Paper 2 Offline Chemistry - Solutions Question 7 English

A

I : KCl

II : CH3OH

III : CH3(CH2)11 OSO$$_3^ - $$ Na+

B

I. CH3(CH2)11 OSO$$_3^ - $$ Na+

II. CH3OH

III. KCl

C

I. KCl

II. CH3(CH2)11 OSO$$_3^ - $$ Na+

III. CH3OH

D

I. CH3OH

II. KCl

III. CH3(CH2)11 OSO$$_3^ - $$ Na+

2
IIT-JEE 2012 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-0.75
For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100 g of water. the elevation in boiling point at 1 atm pressure is 2oC. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take Kb = 0.76 K Kg mol-1)
A
724
B
780
C
736
D
718
3
IIT-JEE 2011 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-0.75
The freezing point (in oC) of a solution containing 0.1 g of K3[Fe(CN)6] (Mol. wt. 329) in 100 g of water (Kf = 1.86 K kg mol-1) is
A
-2.3 $$\times$$ 10-2
B
-5.7 $$\times$$ 10-2
C
-5.7 $$\times$$ 10-3
D
-1.2 $$\times$$ 10-2
4
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

The Henry's law constant for the solubility of N$$_2$$ gas in water at 298 K is 1.0 $$\times$$ 10$$^5$$ atm. The mole fraction of N$$_2$$ in air is 0.8. The number of moles of N$$_2$$ from air dissolved in 10 moles of water at 298 K and 5 atm pressure is

A
4.0 $$\times$$ 10$$^{-4}$$
B
4.0 $$\times$$ 10$$^{-5}$$
C
5.0 $$\times$$ 10$$^{-4}$$
D
4.0 $$\times$$ 10$$^{-6}$$
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