The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in AxB. The value of x is _________ (Integer answer)
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Solution
Anions froms CCP or FCC $\left(\mathrm{A}^{-}\right)=4 \mathrm{~A}^{-}$per unit cell Cations occupy all octahedral voids $\left(\mathrm{B}^{+}\right)=4 \mathrm{~B}^{+}$per unit cell cell formula $\rightarrow \mathrm{A}_4 \mathrm{~B}_4$ Empirical formula $\rightarrow \mathrm{AB} \rightarrow(\mathrm{x}=1)$
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