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The size of Cl^(-) ion is 1.8Å . The siz...

The size of `Cl^(-)` ion is `1.8Å` . The size of a cation for which a change in coordination just becomes possible from 6 to 8 in an ideal ionic crystal would be `:`

A

`0.7452 Å`

B

`1.3176 Å`

C

`0.405 Å`

D

`1.8 Å`

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To solve the problem, we need to determine the size of the cation for which a change in coordination number from 6 to 8 becomes possible in an ideal ionic crystal, given that the size of the Cl⁻ ion is 1.8 Å. ### Step-by-Step Solution: 1. **Understand Coordination Numbers and Radius Ratio**: - The coordination number (CN) refers to the number of nearest neighbors surrounding a central ion in a crystal structure. - For coordination number 6, the radius ratio (r_cation/r_anion) lies between 0.414 and 0.732. - For coordination number 8, the radius ratio lies between 0.732 and 1.00. ...
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VMC MODULES ENGLISH-THE SOLID STATE-LEVEL-1
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  2. Schottky defect occurs mainly in electrovalent compounds where

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  3. Which of the following statements is correct?

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  4. In a face centred cubic arrangement of A and B atoms whose A atoms are...

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  5. Which of the following defects, if present, lowers the density of the ...

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  6. Schottky defect is generally observed in :

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  7. The flame colours of metal ions are due to

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  8. Doping of silicon (Si) with boron (B) leads to the formation of

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  9. Density of a crystal remains unchanged as a result of :

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  10. Which of the following statement is true?

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  11. If we mix a pentavalent impurity in a crystal lattice of germanium, wh...

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  12. Which of the following has the highest value of energy gap ?

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  13. The elements commonly used for making transistors are :

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  14. How many 'nearest' and 'next nearest' neighbours respectively does sod...

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  15. The cation/anion radius ratio for a triangular arrangement of anions i...

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  16. if a metal has a bcc crystal structure, the coordination number is 8,b...

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  17. In a ccp structure, the :

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  18. The numbers of tetrahedral and octahedral holes in a ccp array of 100 ...

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  19. The size of Cl^(-) ion is 1.8Å . The size of a cation for which a chan...

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  20. Lithium forms body centred cubic structure. The length of the side of ...

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