1. What does the square of the wave function, |ψ|², represent at a point in an orbital?
A.
The energy of the electron
B.
The probability density of finding the electron
C.
The charge of the nucleus
D.
The speed of the electron
Correct Answer:
The probability density of finding the electron
2. The probability of finding an electron in a small region of space depends on:
A.
The volume of the region and probability density
B.
Only the mass of the electron
C.
Only the charge of the nucleus
D.
The colour of the orbital
Correct Answer:
The volume of the region and probability density
3. An orbital is best described as a region of space where there is a high probability of finding:
A.
A proton
B.
A neutron
C.
An electron
D.
A nucleus only
Correct Answer:
An electron
4. The total probability of finding an electron somewhere in its orbital is:
A.
Zero
B.
0.5
C.
One
D.
Infinite
Correct Answer:
One
5. Which quantity cannot have a negative value when it represents probability density?
A.
Wave function ψ
B.
Probability density |ψ|²
C.
Orbital energy
D.
Electron charge
Correct Answer:
Probability density |ψ|²
6. If the value of |ψ|² is large in a region, the probability of finding the electron there is:
A.
High
B.
Zero
C.
Always one
D.
Unrelated to the value of |ψ|²
Correct Answer:
High
7. A region in an orbital where the probability of finding an electron is zero is called a:
A.
Probability maximum
B.
Node
C.
Nucleus
D.
Shell
Correct Answer:
Node
8. At a node, the probability density of finding an electron is:
A.
Maximum
B.
Half of its maximum value
C.
Zero
D.
Always one
Correct Answer:
Zero
9. An electron cloud diagram mainly represents the:
A.
Exact path of an electron
B.
Probability distribution of an electron
C.
Size of the nucleus only
D.
Mass distribution of protons
Correct Answer:
Probability distribution of an electron
10. In a probability-density diagram, a darker region generally indicates:
A.
A lower probability of finding the electron
B.
A higher probability of finding the electron
C.
The absence of an electron
D.
A negative probability
Correct Answer:
A higher probability of finding the electron
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