Metal Excess Defect in Zinc Oxide ZnO

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Chemistry, Science, Physics
•
10th Grade - University
•
Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What role do free electrons play in metal excess defects?
They replace cations in the crystal lattice.
They cause the crystal to become brittle.
They occupy interstitial positions to maintain electrical neutrality.
They are responsible for the crystal's hardness.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the presence of metal excess defects affect the electrical conductivity of a crystal?
It has no effect on conductivity.
It decreases the conductivity.
It makes the crystal non-conductive.
It increases the conductivity.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to zinc oxide crystals when they are heated?
They turn yellow.
They remain white.
They become transparent.
They turn blue.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes the yellow coloration in heated zinc oxide crystals?
Emission of yellow light by free electrons.
Absorption of ultraviolet light by zinc ions.
Reflection of light by the crystal surface.
Presence of impurities in the crystal.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the free electrons in zinc oxide crystals when light falls on them?
They get excited and emit yellow light.
They emit blue light.
They are absorbed by the crystal lattice.
They cause the crystal to expand.
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