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


13.
Which orbital has zero radial nodes?
A.
3s
B.
2s
C.
1s
D.
4s
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ANSWER :
C. 1s
14.
The plot of ψ(r) versus r for 1s and 2s orbitals differ in that:
A.
Both have the same shape
B.
1s has positive values throughout, while 2s changes sign (passes through zero)
C.
2s never becomes zero
D.
1s has more nodes than 2s
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ANSWER :
B. 1s has positive values throughout, while 2s changes sign (passes through zero)
15.
The number of nodes for a 4s orbital is:
A.
Four
B.
One
C.
Two
D.
Three
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ANSWER :
D. Three
16.
Which of the following is TRUE about probability density (|ψ|²)?
A.
It can be negative for some orbitals
B.
It is zero throughout the space
C.
It is always positive
D.
It has units of volume
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ANSWER :
C. It is always positive
17.
The boundary surface diagram of an orbital is drawn such that the probability of finding the electron inside it is approximately:
A.
75%
B.
50%
C.
90%
D.
100%
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ANSWER :
C. 90%
18.
Why is it not possible to draw a boundary surface diagram with 100% probability of finding the electron?
A.
Because |ψ|² has some finite value at any finite distance from the nucleus
B.
Because the electron escapes from the atom
C.
Because |ψ|² becomes infinite at large distances
D.
Because the orbital does not exist beyond a certain limit
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ANSWER :
A. Because |ψ|² has some finite value at any finite distance from the nucleus