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The mass of unit cell of CaF(2) (fluorit...

The mass of unit cell of `CaF_(2)` (fluorite structure) corresponds to

A

mass of `8 Ca^(++)` ions and `4F^(-)` ions

B

mass of `4Ca^(++)` ions and `8F^(-)` ions

C

mass of `4 Ca^(++)` ions and `4F^(-)` ions

D

mass of `1 Ca^(++)` ions and `2F^(-)` ions

Text Solution

Verified by Experts

The correct Answer is:
B
In `CaF_(2)` (calacum floorite) 1- unit cell contain `4 Ca^(2+)` ions `8F` ions
so mass of unit cells of `CaF2`
= mass of `4 Ca^(2+)` ions + mass of `8F` ions
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Knowledge Check

  • The mass of unit cell of Na_(2)O is

    A
    Twice the formula mass of `Na_(2)O`
    B
    Four times the formula mass of `Na_(2)O`
    C
    Six times the formula mass of `Na_(2)O`
    D
    Thrice the formula mass of `Na_(2)O`

  • 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

  • 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

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