centred cubic cell of an e radius of the cation is . The edges length of a face-centred cubic ionic substance is 508 pm. If the radius of the 110 pm, the radius of the anion is a. 618 pm b. 144 pm .288 pm d. 398 pm

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For an fcc solid, edge length, ( a=2left(r^{+}+r^{-}right) ) ( Rightarrow 2left(110+r^{-}right)=508 ) ( Rightarrow 220+2 r^{-}=508 ) ( Rightarrow 2 r^{-}=508-220 ) ( Rightarrow 2 r^{-}=288 ) ( therefore r^{-}=144 p m )

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