Concept of Atomic Orbitals as One-Electron Wave Functions... NEET Questions

Physical Chemistry - Atomic Structure

Concept of Atomic Orbitals as One-Electron Wave Functions... MCQ Questions


1.
An atomic orbital is best defined as:
A.
A one-electron wave function (ψ) obtained from solving the Schrödinger equation
B.
A region where the electron is always present
C.
A circular path of electrons around the nucleus
D.
A fixed orbit of definite radius and energy
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ANSWER :
A. A one-electron wave function (ψ) obtained from solving the Schrödinger equation
2.
The physical significance of ψ² at a point in an atom is:
A.
It gives the energy of the electron at that point
B.
It represents the amplitude of the electron wave
C.
It gives the probability density of finding the electron at that point
D.
It represents the wavelength of the electron
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ANSWER :
C. It gives the probability density of finding the electron at that point
3.
For a 1s orbital, the variation of ψ(r) with distance r from the nucleus shows:
A.
Zero at nucleus and increases with r
B.
Maximum value at the nucleus and decreases sharply as r increases
C.
First increases then decreases
D.
Constant value for all values of r
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ANSWER :
B. Maximum value at the nucleus and decreases sharply as r increases
4.
The number of radial nodes in a 2s orbital is:
A.
Zero
B.
Two
C.
One
D.
Three
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ANSWER :
C. One
5.
For a 2s orbital, the variation of ψ²(r) with r shows:
A.
Sharp decrease to zero, then increases to a small maximum, then decreases approaching zero
B.
Continuous decrease without any node
C.
Constant value throughout
D.
Continuous increase with r
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ANSWER :
A. Sharp decrease to zero, then increases to a small maximum, then decreases approaching zero
6.
A nodal surface is defined as the region where:
A.
The probability density function ψ² reduces to zero
B.
The orbital reaches its boundary
C.
Energy of the electron becomes zero
D.
Electron density is maximum
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ANSWER :
A. The probability density function ψ² reduces to zero