The molar heat of vapourization of toluene is AHv. If its vapour pressure at 315 K is 60 torr & that at 356K is300 torr then AHv = ? (log 2 = 0.3)

(1) 37.5 kJ/mole

(2) 3.75 kJ/mole

(3) 37.5 J/mol

(4) 3.75 J/mole

Subtopic:  Relative Lowering of Vapour Pressure |
 50%
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Relative decrease in vapour pressure of an aqueous solution containing 2 moles [Cu(NH3)3Cl) Cl in 3 moles H2O is 0.50. On reaction with AgNO3, this solution will form (assuming no change in degree of ionisation of substance on adding AgNO3)

(1) 1 mol AgCl

(2) 0.25 mol AgCl

(3) 0.5 mol AgCl

(4) 0.40 mol AgCl

Subtopic:  Relative Lowering of Vapour Pressure |
From NCERT
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Which of the following has been arranged in order of decreasing freezing point?

(1) 0.05 M KNO3 > 0.04 M CaCl2 > 0.140 M sugar > 0.075 M CuSO4

(2) 0.04 M BaCl2 > 0.140 M sucrose > 0.075 M CuSO4 > 0.05 M KNO3

(3) 0.075 MCuSO4 > 0.140 M sucrose > 0.04 M BaCl2 > 0.05 M KNO3

(4) 0.075 M CuSO4 > 0.05 M NaNO3 > 0.140 M sucrose > 0.04 M BaCl2

Subtopic:  Depression of Freezing Point |
 52%
From NCERT
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A solution of x moles of sucrose in 100 grams of water freezes at −0.2°C. As ice separated the freezing point goes down to 0.25°C. How many grams of ice would have separated?

(1) 10 grams

(2) 20 grams

(3) 25 grams

(4) 23 grams

Subtopic:  Depression of Freezing Point |
 61%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

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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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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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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