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which of the following defects decras...

which of the following defects decrase the density decrease the density ?

A

interstitial defect

B

Vacancy defect

C

Frenkel defect

D

Schottky defect

Text Solution

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The correct Answer is:
To determine which defects decrease the density of a solid, we need to analyze the types of defects mentioned: interstitial defect, vacancy defect, Frenkel defect, and Schottky defect. ### Step-by-Step Solution: 1. **Understand the Types of Defects**: - **Interstitial Defect**: This occurs when extra atoms are inserted into the lattice at interstitial sites (spaces between the regular lattice points). The total number of atoms remains the same, so the density does not decrease. - **Vacancy Defect**: This defect arises when atoms or ions are missing from their lattice sites. The absence of these atoms reduces the total mass of the solid without changing its volume, leading to a decrease in density. - **Frenkel Defect**: This is a type of interstitial defect where an atom leaves its normal site and occupies an interstitial site. Since the total number of atoms remains the same, there is no decrease in density. - **Schottky Defect**: This defect involves the simultaneous absence of an equal number of cations and anions from the lattice. This results in a decrease in the total number of atoms in the crystal, thus decreasing the density. 2. **Identify the Defects that Decrease Density**: - From the analysis: - **Interstitial Defect**: No decrease in density. - **Vacancy Defect**: Decreases density. - **Frenkel Defect**: No decrease in density. - **Schottky Defect**: Decreases density. 3. **Conclusion**: - The defects that decrease the density of the solid are the **Vacancy Defect** and the **Schottky Defect**. ### Final Answer: The defects that decrease the density are: - Vacancy Defect - Schottky Defect

To determine which defects decrease the density of a solid, we need to analyze the types of defects mentioned: interstitial defect, vacancy defect, Frenkel defect, and Schottky defect. ### Step-by-Step Solution: 1. **Understand the Types of Defects**: - **Interstitial Defect**: This occurs when extra atoms are inserted into the lattice at interstitial sites (spaces between the regular lattice points). The total number of atoms remains the same, so the density does not decrease. - **Vacancy Defect**: This defect arises when atoms or ions are missing from their lattice sites. The absence of these atoms reduces the total mass of the solid without changing its volume, leading to a decrease in density. - **Frenkel Defect**: This is a type of interstitial defect where an atom leaves its normal site and occupies an interstitial site. Since the total number of atoms remains the same, there is no decrease in density. ...
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