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An ionic crystal AB crystallises in bcc ...

An ionic crystal `AB` crystallises in bcc lattice.If the cationic radius is `1.7Å` and anionic radius is `1.8Å` ,then find out the density of crystal `AB` (formula mass of `AB` is 168.5 g/mol) `[((7)/(sqrt(3)))^(3)=66]`

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