An ideal mixture of liquids A and B with 2 moles of A and 2 moles of B has a total vapour pressure of 1 atm at a certain temperature. Another mixture with 1 mole of A and 3 moles of B has a vapour pressure greater than 1 atm. But if 4 moles of C are added to the second mixture, the vapour pressure comes down to 1 atm. Vapour pressure of C, Pc° = 0.8 atm. Calculate the vapour pressures of pure A and pure B.

(1) PA° = 1.4 atm, PB° = 0.7 atm

(2) PA = 1.2 atm, PB° = 0.6 atm

(3) PA = 1.4 atm, PB° = 0.6 atm

(4) PA° = 0.6 atm, PB° = 1.4 atm

Subtopic:  Dalton’s Law of Partial Pressure |
 60%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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A sample of air is saturated with benzene (vapor pressure = 100 mm Hg at 298 K) at 298K, 750mm Hgpressure. If it is isothermally compressed to one third of its initial volume, the final pressure of the system is

(1) 2250 torr

(2) 2150 torr

(3) 2050 torr

(4) 1950 torr

Subtopic:  Relative Lowering of Vapour Pressure |
From NCERT
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Available solutions are 1L of 0.1 M NaCl and 2L of 0.2 M CaCl2. Using only these two solutions what maximum volume of a solution can be prepared having [Cl] = 0.34M exactly. Both electrolytes are strong

(1) 2.5 L

(2) 2.4 L

(3) 2.3 L

(4) None of these

Subtopic:  Concentration Terms & Henry's Law |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Consider equimolal aqueous solutions of NaHSO4 and NaCl with Tb and T'b as their respective boiling point elevations. The value of limx0ΔTbΔTb' will be :

(1) 1

(2) 1.5

(3) 3.5

(4) 3

Subtopic:  Elevation of Boiling Point |
 51%
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The vapor pressures of benzene, toluene and a xylene are 75 Torr, 22 Torr and 10 Torr at 20°C. Which of the following is not a possible value of the vapor pressure of an equimolar binary/ternary solution of these at 20°C ? Assume all form ideal solution with each other.

(1) 4812

(2) 16

(3) 3523

(4) 5312

Subtopic:  Dalton’s Law of Partial Pressure |
From NCERT
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3.24 g of Hg(NO3)2 (molar mass = 324) dissolved in 1000 g of water constitutes a solution having a freezing point of –0.0558°C while 21.68 g of HgCl2 (molar mass = 271) in 2000 g of water constitutes a solution with a freezing point of –0.0744°C. The Kf for water is 1.86 K – KgMol. About the state of ionization of these two solids in water it can be inferred that:

(1) Hg(NO3)2 and HgCl2 both are completely ionized

(2) Hg(NO3)2 is fully ionized but HgCl2 is fully unionized

(3) Hg(NO3)2 and HgCl2 both are completely unionized

(4) Hg(NO3)2 is fully unionized but HgCl2 is fully ionized  

Subtopic:  Concentration Terms & Henry's Law |
 63%
From NCERT
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15 g of methyl alcohol is dissolved in 35 g of water. The weight percentage of methyl alcohol in solution is

1. 30%

2. 50%

3. 70%

4. 75%

Subtopic:  Concentration Terms & Henry's Law |
 81%
From NCERT
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The seawater sample contains 5.8 × 10–3 g of dissolved oxygen per kilogram of the sample. The concentration of oxygen in parts per million is-

1. 5.8 ppm

2. 58.5 ppm

3. 0.58 ppm

4. 0.05 ppm

Subtopic:  Concentration Terms & Henry's Law |
 76%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A 500 gm toothpaste sample has 0.2 g fluoride concentration. The concentration of fluoride ions in terms of ppm level is

(1) 250 ppm

(2) 200 ppm

(3) 400 ppm

(4) 1000 ppm

Subtopic:  Concentration Terms & Henry's Law |
 78%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Normality of a solution containing 9.8 g of H2SO4 in 250 cm3 of the solution is

[MP PMT 1995, 2003; CMC Vellore 1991; JIPMER 1991]

(1) 0.8 N

(2) 1 N

(3) 0.08 N

(4) 1.8 N

Subtopic:  Concentration Terms & Henry's Law |
 74%
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