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


7.
Atomic orbitals in the quantum mechanical model are characterized by:
A.
Two quantum numbers (n and l)
B.
A set of three quantum numbers (n, l, ml)
C.
Only the principal quantum number
D.
Four quantum numbers including spin
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ANSWER :
B. A set of three quantum numbers (n, l, ml)
8.
When the Schrödinger equation is solved for the hydrogen atom, the solution gives:
A.
Possible energy levels and corresponding wave functions
B.
The exact trajectory of the electron
C.
Only the velocity of the electron
D.
Only the position of the electron
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ANSWER :
A. Possible energy levels and corresponding wave functions
9.
The wave functions of hydrogen or hydrogen-like species with one electron are called:
A.
Hybrid orbitals
B.
Bonding orbitals
C.
Atomic orbitals
D.
Molecular orbitals
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ANSWER :
C. Atomic orbitals
10.
The major difference between orbitals in hydrogen atom and multi-electron atoms is:
A.
Multi-electron atoms have no orbitals
B.
Hydrogen has no s-orbitals
C.
Hydrogen orbitals have lower energy
D.
Multi-electron orbitals are slightly contracted due to increased nuclear charge
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ANSWER :
D. Multi-electron orbitals are slightly contracted due to increased nuclear charge
11.
In the quantum mechanical model, an orbital cannot contain more than:
A.
Three electrons
B.
Two electrons
C.
One electron
D.
Four electrons
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ANSWER :
B. Two electrons
12.
Quantum mechanics was developed independently in 1926 by:
A.
Bohr and Rutherford
B.
Heisenberg and Schrödinger
C.
Planck and Einstein
D.
de Broglie and Born
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ANSWER :
B. Heisenberg and Schrödinger