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Statement-1: In fluorite structure, r^(+...

Statement-1: In fluorite structure, `r^(+)/r^(-) gt 1`
Statement-2: There are 4 unoccupied octahedral positions in a unit cell of `CaF_2`
Statement-3:There are 4 unoccupied tetrahedral positions in a unit cell of `CaF_2`.

A

T F F

B

T F T

C

F F F

D

T T F

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Statement-1: The octahedral voids have double the size of the tetrahedral voids in a crystal. Statement-2: The number of tetrahedral voids is double the number of octahedral voids in a crystal

    A
    Statement 1 is True , Statement-2 is True , Statement-2 is a correct explanation for statement-1
    B
    Statement 1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation of Statement-1
    C
    Statement-1 is True , Statement-2 is False
    D
    Statement -1 is False , Statement -2 is True

  • Statement-1 : There is no scope of axial and equatrorial position in case of tetraheral and octahedral geometry. Statement-2 : Both are perfect geometry in which all positions are identical.

    A
    Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.
    B
    Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.
    C
    Statement-1 is True, Statement-2 is False.
    D
    Statement-1 is False, Statement-2 is True.

  • Statement-1 : The ratio of Zn^2+ and F^(-) per unit cell of ZnS and CaF_2 is 1 :2 Statement-2 : In ZnS, Zn^2+ ions occupy alternate tetrahedral voids and in CaF_2, F^(-) ions occupy all the tetrahedral voids of FCC unit cell.

    A
    Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
    B
    Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
    C
    Statement-1 is True, Statement-2 is False.
    D
    Statement-1 is False, Statement-2 is True.