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Which one of the following statements is incorrect about rock

Question

Which one of the following statements is incorrect about rock salt type?

A

It has fcc arrangement of

Na^{+}

B

Nat and Cl-ions have a co-ordination number of

6 : 6

C

A unit cell of

N a Cl

consists of four

N a Cl

units

D

All halides of alkali metals have rock-salt type structure

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Text solutionVerified

The alkali halides crystallize in the NaCl structure also known as rock-salt structure (rock salt is the mineral form of sodium chloride); exceptions being CsCl, CsBr, and CsI, which crystallize in the CsCl structure. In the NaCl structure (face-centered cubic lattice), each cation is surrounding by six anions, and vice versa (coordination number of 6). In the CsCl structure, each cation is surrounded by eight anions and vice versa (coordination number of 8).

Option D is incorrect

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Question Text	Which one of the following statements is incorrect about rock salt type?
Answer Type	Text solution:1
Upvotes	151