If 20 ml of 0.4 N NaOH solution completely neutralises 40 ml of dibasic acid. The molarity of acid solution is [EAMCET 1992; DPMT 1994; JIPMER 1994]

(1) 0.1 M

(2) 0.2 M

(2) 0.3 M

(4) 0.4 M

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H2SO4 solution whose specific gravity is 1.98 g ml–1 and H2SO4 by volume is 95%. The molality of the solution will be

(1) 7.412

(2) 8.412

(3) 9.412

(4) 10.412

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The density of H2SO4 solution is 1.84 gm ml–1. In 1 litre solution H2SO4 is 93% by volume then, the molality of solution is [UPSEAT 2000]

(1) 9.42

(2) 10.42

(3) 11.42

(4) 12.42

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A solution contains 16 gm of methanol and 90 gm of water, mole fraction of methanol is [BHU 1981, 87; EAMCET 2003]

(1) 0.90

(2) 0.090

(3) 0.1

(4) 1.9

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Concentration Term and Numericals
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A solution has 25% of water, 25% ethanol and 50% acetic acid by mass. The mole fraction of each component will be [EAMCET 1993]

(1) 0.50, 0.3, 0.19

(2) 0.19, 0.3, 0.50

(3) 0.3, 0.19, 0.5

(4) 0.50, 0.19, 0.3

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Concentration Term and Numericals
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34.2 g of cane sugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be

(1) 0.0099

(2) 1.1597

(3) 0.840

(4) 0.9901

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Lowering in vapour pressure is the highest for [Roorkee 1989; BHU 1997]

(1) 0.2m urea

(2) 0.1 m glucose

(3) 0.1m MgSO4

(4) 0.1m BaCl2

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Vapour pressure of CCl4 at 25°C is 143 mm Hg 0.5 g of a non-volatile solute (mol. wt. 65) is dissolved in 100 ml of CCl4. Find the vapour pressure of the solution. (Density of CCl4=1.58g/cm3) [CBSE PMT 1996]

(1) 141.93 mm

(2) 94.39 mm

(3) 199.34 mm

(4) 143.99 mm

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The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour pressure in contact with equimolar solution of benzene and toluene is [Pb. CET 1988]

(1) 0.50

(2) 0.6

(3) 0.27

(4) 0.73

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Concentration Term and Numericals
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The vapour pressure of a solvent decreases by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be if the decrease in vapour pressure is to be 20 mm of mercury then the mole fraction of the solvent is [CBSE PMT 1998]

(1) 0.8

(2) 0.6

(3) 0.4

(4) None

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Concentration Term and Numericals
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