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An example of fluorite structure is:...

An example of fluorite structure is:

A

NaF

B

`SrF_(2)`

C

`AlCl_(3)`

D

`SiF_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`SrF_(2)` has fluorite `(CaF_(2))` type structure.
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Assertion : An important feature of fluorite structure is that cations being large ib size occupy FC C lattice points, the formula unit AB_(2) (A cation, B anion) Reason: There are 6 cations and 12 anions per FC C unit cell of the flucrite structure

If edge fraction unoccupied in ideal anti -fluorite structure is x . Caluclate the value of Z. Where Z=(x)/(0.097) .

In fluorite structure of AB_2

Antifluorite structure is derived from fluorite structure by:

A unit cell of BaCl_2 (fluorite structure) is made up of

STATEMENT -1 : For fluorite structure , the F^(-) ions occupy tetrahedral void and Ca^(2+) ions in ccp STATEMENT-2 : The radius ratio of fluorte structure is 0.414

In fluorite structure (CaF_2) -

Knowledge Check

  • Assertion : An important feature of fluorite structure is that cations being large ib size occupy FC C lattice points, the formula unit AB_(2) (A cation, B anion) Reason: There are 6 cations and 12 anions per FC C unit cell of the flucrite structure

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion
    C
    If assertion is true bur reason is false
    D
    If assertion is false bur reason is true

  • In fluorite structure of AB_2

    A
    On subjecting to strong heating it changes to antifluorite structure
    B
    Interchanging the position of positive and negative ion changes to antifluorite structure
    C
    Coordination number of A=8 and B=4
    D
    Coordination number of A=4 and B=8

  • A unit cell of BaCl_2 (fluorite structure) is made up of

    A
    four `Ba^(2+)` ions and four `Cl^-` ions
    B
    four `Ba^(2+)` ions and eight `Cl^-` ions
    C
    eight `Ba^(2+)` ions and four `Cl^-` ions
    D
    four `Ba^(2+)` ions and six `Cl^-` ions
    • ERRORLESS-SOLID STATE-NCERT BASED QUESTIONS (CRYSTAL STRUCTURE AND COORDINATION NUMBER)
    1. An example of fluorite structure is:

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    2. The interionic distance for cesium chloride crystal will be

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    3. In the distance between Na^(+) and CI^(-) ions in sodium chliride crys...

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    4. A solid has a structure in which W atoms are located at the corners of...

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    5. Body -centred cubic lattice has a corrdination number of

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    6. A solid compound contains X,Y and Z atoms in a cubic lattice with X at...

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    7. The unit cell of a binary compound of A and B metals has a ccp structu...

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    8. Radius ratio of an ionic compound is 0.93. the structure of the above ...

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    9. In the closest packed struture of a metallic lattice , the number of m...

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    10. Structure of zinc blende|Structure of fluorite| Structure of anti fluo...

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    11. The ionic radii of Rb^(+) and I^(-) are 1.46 and 2.16Å. The most proba...

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    12. in which of the following structures coordination number for cati...

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    13. What is the coordination number in a square close packed structures in...

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    14. Which of the following statements is not true about NaCl structure?

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    15. In CsCl structure, the coordination number of Cs^(+) is

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    16. Point out the correct statement for the set of characteristics of ZnS ...

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    17. The crystal structure of solid Mn(II) oxide is

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    18. In Na2O, having antifluorite structure

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    19. A unit cell of calcium fluoride has four calcium ions. The number of f...

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    20. A mineral consists of a cubic close-packed structure formed by O^(2-) ...

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