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(D) The magnitude of the enthalpy of formation $(\Delta H_f)$ for alkali metal halides is primarily governed by the lattice energy and the hydration e

Vedclass · Accepted Answer

$LiI > NaI > RbI > CsI$

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(D) The magnitude of the enthalpy of formation $(\Delta H_f)$ for alkali metal halides is primarily governed by the lattice energy and the hydration energy. For a given metal,the enthalpy of formation becomes less negative (smaller magnitude) as the size of the halide ion increases from $F^-$ to $I^-$. Thus,the order is $Fluoride > Chloride > Bromide > Iodide$. For a given halide,the enthalpy of formation becomes less negative as the size of the alkali metal cation increases down the group. Thus,for iodides,the order is $LiI > NaI > RbI > CsI$.

Which of the following orders is correct with respect to the magnitude of enthalpies of formation for alkali metal halides?

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