Chemistry Exam > Chemistry Questions > Which is the incorrect statement:a)Density de...
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Which is the incorrect statement:
- a)Density decreases in case of crystals with Schottky defect.
- b)NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal.
- c)Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals.
- d)FeO0.98 has non-stoichiometric metal deficiency defect.
Correct answer is option 'C,D'. Can you explain this answer?
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Which is the incorrect statement:a)Density decreases in case of crysta...
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Which is the incorrect statement:a)Density decreases in case of crysta...
Incorrect statements:
C) Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals.
D) FeO0.98 has non-stoichiometric metal deficiency defect.
Explanation:
A) Density decreases in case of crystals with Schottky defect:
- Schottky defect is a type of point defect in which equal numbers of cations and anions are missing from the crystal lattice.
- As a result, the crystal becomes less dense because some of the atoms are missing.
- Therefore, this statement is correct.
B) NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal:
- NaCl(s) is an ionic compound that does not conduct electricity in its solid state. Therefore, it is an insulator.
- Silicon is a semiconductor because it has an intermediate conductivity between that of a conductor and an insulator.
- Silver is a good conductor of electricity because it has a high number of free electrons that can move through its lattice.
- Quartz is a piezoelectric crystal because it can generate an electric charge when subjected to mechanical stress.
- Therefore, this statement is also correct.
C) Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals:
- Frenkel defect is a type of point defect in which a cation is displaced from its lattice site and occupies an interstitial site in the crystal lattice.
- This defect is favored in ionic compounds in which the cation is much smaller than the anion.
- Therefore, this statement is incorrect.
D) FeO0.98 has non-stoichiometric metal deficiency defect:
- Non-stoichiometric metal deficiency defect is a type of point defect in which some of the metal ions are missing from the crystal lattice.
- FeO0.98 has a metal deficiency because it has fewer Fe ions than the stoichiometric ratio of FeO.
- Therefore, this statement is correct.
In conclusion, the incorrect statements are C) Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals, and D) FeO0.98 has non-stoichiometric metal deficiency defect.
C) Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals.
D) FeO0.98 has non-stoichiometric metal deficiency defect.
Explanation:
A) Density decreases in case of crystals with Schottky defect:
- Schottky defect is a type of point defect in which equal numbers of cations and anions are missing from the crystal lattice.
- As a result, the crystal becomes less dense because some of the atoms are missing.
- Therefore, this statement is correct.
B) NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal:
- NaCl(s) is an ionic compound that does not conduct electricity in its solid state. Therefore, it is an insulator.
- Silicon is a semiconductor because it has an intermediate conductivity between that of a conductor and an insulator.
- Silver is a good conductor of electricity because it has a high number of free electrons that can move through its lattice.
- Quartz is a piezoelectric crystal because it can generate an electric charge when subjected to mechanical stress.
- Therefore, this statement is also correct.
C) Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals:
- Frenkel defect is a type of point defect in which a cation is displaced from its lattice site and occupies an interstitial site in the crystal lattice.
- This defect is favored in ionic compounds in which the cation is much smaller than the anion.
- Therefore, this statement is incorrect.
D) FeO0.98 has non-stoichiometric metal deficiency defect:
- Non-stoichiometric metal deficiency defect is a type of point defect in which some of the metal ions are missing from the crystal lattice.
- FeO0.98 has a metal deficiency because it has fewer Fe ions than the stoichiometric ratio of FeO.
- Therefore, this statement is correct.
In conclusion, the incorrect statements are C) Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals, and D) FeO0.98 has non-stoichiometric metal deficiency defect.
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Which is the incorrect statement:a)Density decreases in case of crysta...
Frenkel defect is commonly found in compounds having a large difference in the radii of the two ions.
FeO0.98 has a non-stoichiometic metal-excess defect.
FeO0.98 has a non-stoichiometic metal-excess defect.
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Which is the incorrect statement:a)Density decreases in case of crystals with Schottky defect.b)NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal.c)Frenkel defect is favored in those ionic compounds in which sizes of cations and anions are almost equals.d)FeO0.98 has non-stoichiometric metal deficiency defect.Correct answer is option 'C,D'. Can you explain this answer?
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