Navbodh Chemistry Class 11. We covered all the Navbodh Chemistry Class 11 in this post for free so that you can practice well for the exam.
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Which of the following statements about the composition of the vapor over an ideal 1 : 1 molal mixture of benzene and toluene is correct? Assume that the temperature is constant at 25°C. (Given : Vapour pressure data at 25°C, benzene = 12.8 kPa, toluene = 3.85 kPa)
(A) The vapor will contain a higher percentage of toluene
(B) The vapor will contain equal amounts of benzene and toluene
(C) Not enough information is given to make a prediction.
(D) The vapor will contain a higher percentage of benzene
Option d – The vapor will contain a higher percentage of benzene
Van’t a Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barius hydroxide is
(A) 0
(B) 1
(C) 2
(D) 3
Option d – 3
A gas such as carbon monoxide would be most likely to obey the ideal gas law at
(A) High temperature and low pressure
(B) Low temperature and high pressure
(C) High temperature and high pressure
(D) Low temperature and low pressure
Option a – High temperature and low pressure
What is the mole fraction of the solute in a 1.00 m aqueous solution?
(A) 0.177
(B) 1.770
(C) 0.0354
(D) 0.0177
Option d – 0.0177
The mixture which shows positive deviation from Raoult’s law is :
(A) Chloroethane + Bromoethane
(B) Ethanol + Acetone
(C) Benzene + Toluene
(D) Acetone + Chloroform
Option b – Ethanol + Acetone
The mixture that forms maximum boiling azetrope is
(A) Ethanol + water
(B) Acetone + carbon disulfide
(C) Heptane + Octane
(D) Water + nitric acid
Option d – Water + nitric acid
Which of the following is dependent on temperature?
(A) Molality
(B) Molarity
(C) Mole fraction
(D) Weight percentage
Option b – Molarity
If the molality of the dilute solution is doubled, the value of the molal depression constant (K₂) will be
(A) Doubled
(B) Halved
(C) Tripled
(D) Unchanged
Option d – Unchanged
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