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Chemical Properties of Aromatic Compounds

Zc sulphide e...

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Zc sulphide exists in two different structural forms as zincblende (FCC) and Wurtzite (HCP). What will be the coordinationnumber of cation and anion in both the structures?

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STATEMENT-1: An important feature of Fluorite structures is that cations being large in size occupy FCC lattice points whereas anions occupy all the tetrahedral voids giving the formula unit

A B_{2}

(A: cation, B: anion).

STATEMENT-2: There are 6 cations and 12 anions per FCC unit cell of the Fluorite structure.

Q. For an FCC structure and a BCC structure having equal edge length ‘a’ and equal radius for anion, then the difference between cationic radius of BCC and FCC lattice is

Q. Assertion :An important feature of Fluorite structure is that cations being large in size occupy FCC lattice points whereas anions occupy all the tetrahedral voids giving the formula unit

A B_{2}

(A: cation, B: anion). Reason: There are 6 cations and 12 anions per FCC unit cell of the Fluorite structure.

Q. In which of the following structure coordination number for cations and anions in the packed structure will be same?

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C l^{-}$ ions form fcc lattice and $N a^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C a^{2 +}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(c) $O^{2 -}$ ions form fcc lattice and $N a^{+}$ ions occupy all the eight tetrahedral voids of

(d) $S^{2 -}$ ions form fcc lattice and $Z n^{2 +}$ ions go into alternate tetrahedral voids of the unit cell

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