Which of the following orders is correct $:-$
- AThermal stability $: BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4 < BaSO_4$
- BBasic Nature $: ZnO > BeO < MgO > CaO$
- CSolubility in water $: LiOH > NaOH > KOH > RbOH > CsOH$
- DMelting point $: NaCl > RbCl > CsCl > KCl$
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