In Langmuir’s model of adsorption of a gas on a solid surface, the rate of dissociation of adsorbed molecules from the surface does not depend on?
1
The surface covered
2
The adsorption at a single site on the surface
3
The mass of gas striking a given area of surface
4
The pressure of the gas
Official Solution
Correct Option: (4)
Langmuir’s model suggests that adsorption depends on the surface covered, the amount of gas, and the adsorption at a single site. However, it does not depend on the pressure of the gas directly.
02
PYQ 2014
medium
chemistryID: viteee-2
Peptisation involves?
1
Precipitation of colloidal particles
2
Disintegration of colloidal aggregates
3
Evaporation of dispersion medium
4
Impact of molecules of the dispersion medium on the colloidal particles
Official Solution
Correct Option: (2)
Peptisation is the process of converting a precipitate into colloidal particles by shaking it in a liquid with the help of a dispersing agent.
03
PYQ 2014
medium
chemistryID: viteee-2
Following process is known as?
1
A
2
B
3
C
4
D
Official Solution
Correct Option: (2)
The process described, where a photon interacts with a material and causes the emission of an electron, is known as the photoelectric effect. This phenomenon is crucial in understanding the behavior of light and matter.
04
PYQ 2015
medium
chemistryID: viteee-2
Which one of the following is a case of negative adsorption?
1
Acetic acid solution in contact with animal charcoal.
2
Dilute KCl solution in contact with blood charcoal.
3
Concentration KCl solution in contact with blood charcoal.
4
H gas in contact with charcoal at 300 K.
Official Solution
Correct Option: (3)
Negative adsorption occurs when the adsorbate concentration decreases at the surface, which is observed when KCl solution is in contact with charcoal. This results in the concentration being lower at the surface than in the bulk.
05
PYQ 2024
medium
chemistryID: viteee-2
Which of the following alkyl halides will undergo reaction most readily?
1
2
3
4
Official Solution
Correct Option: (4)
In an reaction, the leaving group must depart easily, and the carbocation formed must be stable. Among the halides, is the best leaving group, followed by , , and . Since is the best leaving group, the alkyl halide with will undergo reactions most readily. Final Answer: The alkyl halide will undergo the reaction most readily.
06
PYQ 2024
medium
chemistryID: viteee-2
For which one of the following sets of four quantum numbers, an electron will have the highest energy?
1
2
3
4
Official Solution
Correct Option: (2)
Step 1: Understanding Quantum Numbers The four quantum numbers are: (Principal quantum number) - determines the energy level. (Azimuthal quantum number) - determines the subshell. (Magnetic quantum number) - determines the orbital orientation. (Spin quantum number) - represents the electron spin.
Step 2: Energy of an Electron The energy of an electron is primarily determined by the principal quantum number and the azimuthal quantum number . The general rule is that energy increases as increases. If two orbitals have the same value, the one with the higher has higher energy.
Step 3: Calculating Values The highest value is 6, which corresponds to option (B).
Step 4: Determining the Highest Energy The highest energy corresponds to the highest value. If there is a tie, the one with the higher value has the highest energy. Hence, the electron with the highest energy is in option (B) with .
Final Answer: The electron with the highest energy is in (B) .
