Chemistry

Problem

Which order are correct? (I) Thermal stability :

\text{BeSO}_4 < \text{MgSO}_4 < \text{CaSO}_4 < \text{SrSO}_4 < \text{BaSO}_4

(II) Basic nature :

\text{ZnO} > \text{BeO} > \text{MgO} > \text{CaO}

(III) Solubility in water :

\text{LiOH} > \text{NaOH} > \text{KOH} > \text{RbOH} > \text{CsOH}

(IV) Melting point :

\text{NaCl} > \text{KCl} > \text{RbCl} > \text{CsCl} > \text{LiCl}

a. (I), (IV) b. (I), (II) and (IV) c. (II), (III) d. All correct