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Select the correct order of their thermal stability:
(a) \( \mathrm{LiF}\mathrm{NaF}\mathrm{KF}\mathrm{RbF}\mathrm{CsF} \)
(b) \( \mathrm{KF}\mathrm{KCl}\mathrm{KBr}\mathrm{KI} \)
(c) \( \mathrm{LiCl}\mathrm{NaCl}\mathrm{KCl}\mathrm{RbCl}\mathrm{CsCl} \)
(d) \( \mathrm{Li}_{2} \mathrm{O}\mathrm{Na}_{2} \mathrm{O}\mathrm{K}_{2} \mathrm{O}\mathrm{Rb}_{2} \mathrm{O} \)
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