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Significance of a Molecular Formula

Number of for...

Question

Number of formula unit in unit cell of MgO, ZnS, Pt in( fcc)

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Solution

Formula units are 4 in each

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Q. Assertion: Zinc blende and wurtzite both have fcc arrangement of

S^{2 -}

ions.
Reason: A unit cell of both has four formula units of ZnS.

Q. Assertion :The ratio of

Z n^{2 +}

F^{-}

per unit cell ZnS and

C a F_{2}

is 1:2. Reason: In ZnS,

Z n^{2 +}

ions occupy alternate tetrahedral voids and in

C a F_{2}, F^{-}

ions occupy all the tetrahedral voids of FCC unit cell.

What is the number of tetrahedral voids in FCC Unit cell?

Q. The total number of atoms per unit cell in

f c c

Q. In zinc blende (ZnS) structure, the co-ordination number of S^2– ion is (S^2– ion occupy the lattice points of FCC unit cell)

जिंक ब्लेण्ड (ZnS) की संरचना में, S^2– आयन की समन्वय संख्या है (S^2– आयन FCC एकक कोष्ठिका के जालक बिन्दु ग्रहण करते हैं)

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Significance of a Molecular Formula

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