Question

Select the correct order for the given properties-
(I) Thermal Stability: $BaS{O}_4>SrS{O}_4>CaS{O}_4>MgS{O}_4$
(II) Basic Nature: $ZnO>BeO>MgO>CaO$
(III) Solubility in water: $LiOH>NaOH>KOH>RbOH$
(IV) Melting point: $NaCl>KCl>RbCl>LiCl$

• A. $I,$ $IV$
• B. $I,$ $II$ $and$ $IV$
• C. $II,$ $III$
• D. All are correct

Answer 1

Answer: (A)

Basic nature $=$ $CaO>MgO>BeO>ZnO$
Solubility order $=$ $LiOH<NaOH<KOH<RbOH$
Melting point order $NaCl>KCl>RbCl>LiCl$