Q. Which of the following statements about carboxylic acids is incorrect? (2020)
A.
They can form hydrogen bonds.
B.
They have higher boiling points than alcohols.
C.
They are less acidic than alcohols.
D.
They can be converted to esters.
Solution
Carboxylic acids are more acidic than alcohols due to the resonance stabilization of their conjugate base, making the statement 'They are less acidic than alcohols' incorrect.
Correct Answer:
C
— They are less acidic than alcohols.
Q. Which of the following statements about coordination compounds is incorrect? (2023)
A.
They can exhibit geometric isomerism.
B.
They can exhibit optical isomerism.
C.
All coordination compounds are colored.
D.
They can form complexes with transition metals.
Solution
Not all coordination compounds are colored; the color depends on the nature of the metal and the ligands involved. Some coordination compounds can be colorless.
Correct Answer:
C
— All coordination compounds are colored.
Q. Which of the following statements is true for an adiabatic process? (2022) 2022
A.
Heat is exchanged with the surroundings
B.
Work done is zero
C.
Temperature changes
D.
Pressure remains constant
Solution
In an adiabatic process, there is no heat exchange with the surroundings, and the temperature of the system changes due to work done on or by the system.
Q. Which of the following statements is true regarding adsorption isotherms? (2020)
A.
They describe the relationship between pressure and volume.
B.
They describe the relationship between temperature and solubility.
C.
They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
D.
They describe the relationship between the surface area and the mass of adsorbent.
Solution
Adsorption isotherms describe the relationship between the amount of adsorbate on the adsorbent and its pressure at a constant temperature, illustrating how adsorption varies with pressure.
Correct Answer:
C
— They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020)
A.
It applies only to monolayer adsorption.
B.
It is applicable to heterogeneous surfaces.
C.
It predicts a constant adsorption capacity.
D.
It is a linear relationship.
Solution
The Freundlich adsorption isotherm is applicable to heterogeneous surfaces and describes how adsorption varies with pressure or concentration, indicating that it is not limited to monolayer adsorption.
Correct Answer:
B
— It is applicable to heterogeneous surfaces.
Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020) 2020
A.
It is applicable to monolayer adsorption.
B.
It assumes a uniform surface.
C.
It is a linear relationship.
D.
It describes heterogeneous adsorption.
Solution
The Freundlich adsorption isotherm describes heterogeneous adsorption on surfaces with varying affinities, making it suitable for real-world applications.
Correct Answer:
D
— It describes heterogeneous adsorption.
