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In a NaCl structure, if positions of Na ...

In a NaCl structure, if positions of Na atoms and Cl - atoms are interchanged, then in the new unit cell

A

Na atoms is present at body centre

B

Cl atom is present at face centre

C

Na atom is present in tetrahedral voids

D

Cl atoms is present in octahedral voids

Text Solution

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The correct Answer is:
To solve the problem of what happens when the positions of Na+ and Cl- ions are interchanged in a NaCl structure, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the NaCl Structure**: - In a typical NaCl structure, sodium ions (Na+) are located at the corners and the face centers of the cubic unit cell, while chloride ions (Cl-) occupy the octahedral voids. 2. **Identifying the Positions**: - In the NaCl unit cell: - Na+ ions are at the face-centered positions (FCC). - Cl- ions are at the octahedral voids. 3. **Interchanging Positions**: - If we interchange the positions of Na+ and Cl-, then: - Cl- ions will now occupy the face-centered positions. - Na+ ions will occupy the octahedral voids. 4. **Analyzing the New Structure**: - After the interchange: - The Cl- ions will be at the corners and face centers of the unit cell. - The Na+ ions will be in the octahedral voids. 5. **Resulting Structure**: - The new structure formed will not be stable because the sizes of Na+ and Cl- ions are different. Na+ is smaller than Cl-, and placing the larger Cl- ions in positions meant for smaller Na+ ions will lead to instability. 6. **Conclusion**: - The new arrangement will not represent a stable ionic solid and will likely lead to a distortion of the crystal lattice. ### Final Answer: When the positions of Na+ and Cl- ions are interchanged in a NaCl structure, the resulting unit cell will not be stable due to the size mismatch and will lead to a distorted structure.
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Knowledge Check

  • If the positions of Na^+ and Cl^- are interchanged in NaCl , having fcc arrangement of Cl^- ions then in the unit cell of NaCl

    A
    `Na^+` ions will decrease by 1 while `Cl^-` ions will increase by 1
    B
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    C
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    A
    `AB_(2)`
    B
    `A_(2)B`
    C
    `A_(4)B_(3)`
    D
    `A_(3)B_(4)`

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    A
    `Na^(+)` ins will decreass by 1 while `Cl^(-)` ions will increases by I
    B
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    C
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    D
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