Which of the following statements is incorrec | vedclass

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(D) The rock salt structure ($NaCl$ type) is characterized by an $Fcc$ arrangement of anions $(Cl^{-})$ with cations $(Na^{+})$ occupying all octahedr

Vedclass · Accepted Answer

All alkali metal halides have a rock salt type structure.

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(D) The rock salt structure ($NaCl$ type) is characterized by an $Fcc$ arrangement of anions $(Cl^{-})$ with cations $(Na^{+})$ occupying all octahedral voids.Both $Na^{+}$ and $Cl^{-}$ ions have a coordination number of $6:6$.The unit cell contains $4$ $Na^{+}$ ions and $4$ $Cl^{-}$ ions,thus containing $4$ $NaCl$ units.However,not all alkali metal halides have a rock salt structure; for example,$CsCl$ has a body-centered cubic $(Bcc)$ structure due to the larger size of the $Cs^{+}$ ion.Therefore,the statement that all alkali metal halides have a rock salt structure is incorrect.

Which of the following statements is incorrect for the rock salt type structure?

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