Lattice energy of alkali metal chlorides foll | vedclass

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Question

(A) The lattice energy $(U)$ is inversely proportional to the inter-ionic distance $(r^{+} + r^{-})$,where $r^{+}$ and $r^{-}$ are the radii of the ca

Vedclass · Accepted Answer

$LiCl > NaCl > KCl > RbCl > CsCl$

Vedclass · Answer

(A) The lattice energy $(U)$ is inversely proportional to the inter-ionic distance $(r^{+} + r^{-})$,where $r^{+}$ and $r^{-}$ are the radii of the cation and anion,respectively.$U \propto \frac{1}{r^{+} + r^{-}}$As the size of the alkali metal cation increases from $Li^{+}$ to $Cs^{+}$,the inter-ionic distance increases.Therefore,the lattice energy decreases as the size of the cation increases.The correct order is $LiCl > NaCl > KCl > RbCl > CsCl$.

Lattice energy of alkali metal chlorides follows the order

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