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Cationic Radius

What is radiu...

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What is radius for an ion to occupy tetrahedral site

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A^{+} B^{-}

B^{-}

ions arranged in a bcc lattice. If the

A^{+}

ions occupy half of the tetrahedral sites in the structure. The formula of the solid is ?

Q. In a structure,

A

atoms have FCC arrangement,

B

atoms occupy all the tetrahedral sites and

C

atoms occupy half the octahedral sites. The formula of the compound is:

Q. In a structure, A atoms have F.C.C. arrangement, B atoms occupy all the tetrahedral sites and C atoms occupy half the octahedral sites. The formula of the compound is

Q. Give the correct order of initials T (true) or F (False) for following statements:
I. In an anti-fluorite structure, anions form FCC lattice and cations occupy all tetrahedral voids.
II. If the radius of cations and anions are

0.2 ˚ A

0.95 ˚ A

, then co-ordination number of cation in the crystal is

4

.
III. An ion is transferred from a lattice site to an interstitial position in Frenkel defect.
IV. Density of crystal always increases due to substitutional impurity defect.

Q. In an oxide, oxide ions are packed in an FCC unit cell in which

B^{3 +}

ions occupy x% of octahedral voids and

A^{2 +}

ions occupy y% of tetrahedral voids, then which of the following is/are correct about the unit cell?

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