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Assertion (A) : In Rock salt type struct...

Assertion (A) : In Rock salt type structuires, all the coctahedral voids in the close packing of anions are occupied by cations.
Reason(R): In Rock salt structure, the distance of closest apprach between two anions is equal to hal the face diagonal of unit cell.

A

A. If both Assertion and Reason are true and the Reason is the correct explanation of Assertion.

B

B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

C

C. If Assertion is true but the Reason is false

D

D. If both Assertion and Reason are false

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In a binary compound having cubic unit cell the anions 'B' are located at the Corners of the cube and face Corners of the cube and face centres when as cations 'A' occupy all the tetrahedral voids. What is the formula of the compound?

Crystál AB (rock salt structure) has molecular weight '6.023 x u where 'x' is an arbitrary number in u. If the minimum distance between cation and anion is 'x^1/ 3, nm' (i) find the density in 'kgm^-3'. if the measured density is '20 kgm^-3',(ii) Identify the type of point defect.

Knowledge Check

  • Assertion : In rock salt structure, all the octahedral voids in the close packing ofanions are occupied by cations. Reason : In rock salt structure, the distance of closest approach between two anions equal to half the face diagonal of unit cell.

    A
    If both (A) and ( R) are correct and ( R) is the correct explanation of(A).
    B
    If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).
    C
    If (A) is correct, but ( R) is incorrect.
    D
    If both (A) and ( R) are incorrect.

  • Statement 1: In rock salt structure, all the octahedral voids in the close packing of anions are occupied by cations. Statement 2: In rock salt structure, the distance of closest approach between two anions equal to half the face diagonal of unit cell.

    A
    Statement 1 is True, statement 2 is true, statement 2 is 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

  • Two ionic solids AB and CB crystallize in rock salt structure. If r_(A^(o+))//r_(B^(Θ)) and r_(C^(o+))//r_(B^(Θ)) are 0.50 and 0.70, respectively, the ratio of unit cell edge length of AB and CB is

    A
    0.68
    B
    0.78
    C
    0.88
    D
    0.98
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