Discuss the interpretation of the following:
(a) ∆fH °(298 K) becomes less negative along the scries LiF, NaF, KF, RbF, CsF, but more negative along the series Lil, Nal, Kl, RbT, Csl.
(b) The thermal stability of the isomorphous sulfates of Ca, Sr and Ba wilh respect to decomposition into the metal oxide (MO) and SO3 increases in the sequence CaS04 < SrS04 < BaS04.
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