Which orders are correct?(I) Thermal stabilit | vedclass

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(D) $SO_4^{2-}$ is a large anion,therefore thermal stability increases with the size of the cation $(BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4)$.Basic nature

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(D) $SO_4^{2-}$ is a large anion,therefore thermal stability increases with the size of the cation $(BeSO_4 Basic nature increases down the group $(BeO $OH^-$ is a small anion,therefore solubility increases down the group $(LiOH Melting point trend: $NaCl > KCl > RbCl > CsCl > LiCl$ is correct due to the high covalent character of $LiCl$ resulting from its small size and high polarizing power.

Which orders are correct?
$(I)$ Thermal stability: $BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4$
$(II)$ Basic nature: $CaO > MgO > BeO > ZnO$
$(III)$ Solubility in water: $LiOH < NaOH < KOH < RbOH$
$(IV)$ Melting point: $NaCl > KCl > RbCl > CsCl > LiCl$

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Which orders are correct?$(I)$ Thermal stability: $BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4$$(II)$ Basic nature: $CaO > MgO > BeO > ZnO$$(III)$ Solubility in water: $LiOH < NaOH < KOH < RbOH$$(IV)$ Melting point: $NaCl > KCl > RbCl > CsCl > LiCl$