Elementary Ideas of Quantum Mechanics(Quantum Mechanics, the Quantum Mechanical Model of the Atom, its important features) NEET Questions

Physical Chemistry - Atomic Structure

Elementary Ideas of Quantum Mechanics(Quantum Mechanics, the Quantum Mechanical Model of the Atom, its important features) MCQ Questions


13.
The total energy considered in the Hamiltonian operator of Schrödinger equation includes:
A.
Only the rest mass energy
B.
Kinetic energies of all subatomic particles, attractive potential between electrons and nuclei, and repulsive potentials
C.
Only kinetic energy of electrons
D.
Only potential energy between electrons and nuclei
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ANSWER :
B. Kinetic energies of all subatomic particles, attractive potential between electrons and nuclei, and repulsive potentials
14.
According to the quantum mechanical model, the energy of electrons in atoms is:
A.
Continuous, can take any value
B.
Always negative and continuous
C.
Quantized, can have only certain specific values
D.
Always zero
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ANSWER :
C. Quantized, can have only certain specific values
15.
The application of Schrödinger equation to multi-electron atoms:
A.
Gives results identical to hydrogen atom
B.
Cannot be solved exactly and requires approximate methods
C.
Gives exact solutions easily
D.
Is not possible at all
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ANSWER :
B. Cannot be solved exactly and requires approximate methods
16.
|ψ|² is known as:
A.
Wave function
B.
Charge density
C.
Probability density
D.
Energy density
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ANSWER :
C. Probability density
17.
In the quantum mechanical model, the path of an electron in an atom:
A.
Cannot be determined accurately due to Heisenberg's uncertainty principle
B.
Is a helix around the nucleus
C.
Is a perfect circle
D.
Is an ellipse
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ANSWER :
A. Cannot be determined accurately due to Heisenberg's uncertainty principle
18.
The energies of orbitals in multi-electron atoms depend on:
A.
Only quantum number l
B.
Quantum numbers n and l
C.
All four quantum numbers equally
D.
Only quantum number n
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ANSWER :
B. Quantum numbers n and l