Metal Excess Defect
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Choose the property that is represented by the above arrangement of solid particles along AB and CD direction :
- Interstitial compound of iron and carbon
- An alloy of Fe and Cr
- A compound resembling cement
- An ore of iron
- Metal excess defect
- Scottky defect
- Metal deficiency defect
- Vacancy defect
Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.
Question: The colour of NaCl changes when heated in sodium vapour due to
Excess of sodium in the crystal
Electrons in the voids
Excess of chlorine in the crystal
Deficiency of sodium in the crystal
Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.
Question: The colour of NaCl changes when heated in sodium vapour due to
Excess of sodium in the crystal
Electrons in the voids
Excess of chlorine in the crystal
Deficiency of sodium in the crystal
In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.
What is the effect of metal excess defect on density of the crystal?
Increases
Decreases
Remains unaltered
- Decreases, then increases
Reason: Electrons trapped in anion vacancies are referred to as F-centers.
- If both assertion and reason are true and the reason is the correct explanation of the assertion.
- If both assertion and reason are true but reason is not the correct explanation of the assertion.
- If assertion is true but reason is false.
- If the assertion and reason both are false.
Which one of the following crystals does not exhibit Frenkel defefect
AgBr
AgCl
KBr
ZnS
- 1.6
- 2.6
- 3.6
- 4.6