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The stability of the following alkali metal chlorides follows the order

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$L i C l > K C l > N a C l > C s C l$

$C s C l > K C l > N a C l > L i C l$

$N a C l > K C l > L i C l > C s C l$

$K C l > C s C l > N a C l > L i C l$

answer is D.

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Detailed Solution

Stability of a compound depends upon its enthalpy of formation $Δ H f$ . The more negative value of $Δ H f$ shows more stability of a compound. Thus KCl is more stable then LiCl,

$Δ H_{f}$ for $L i C l$ $= - 408 k j / m o l$

$Δ H_{f}$ for $K C l$ $= - 436 k j / m o l$

$∆$ H_f for CsCl = -443 kj/mol

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