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Which of the following stated orders for the given property is/are correct? (Single best correct order to be chosen.) (A) Thermal stability: MgSO4 < SrSO4 < BaSO4 (B) Solubility in water: BeC2O4 < CaC2O4 < BaC2O4 (C) Melting point: LiCl > NaCl > KCl (D) Covalent character: BeF2 > CaF2 > SrF2

1. Thermal stability: MgSO4 < SrSO4 < BaSO4
2. Solubility in water: BeC2O4 < CaC2O4 < BaC2O4
3. Melting point: LiCl > NaCl > KCl
4. Covalent character: BeF2 > CaF2 > SrF2

Correct answer: Thermal stability: MgSO4 < SrSO4 < BaSO4

Solution

Thermal stability of alkaline earth sulphates rises down the group (larger, less polarizing cation), so MgSO4 < SrSO4 < BaSO4 is correct. The other orders are wrong: oxalate solubility decreases down the group, NaCl melts higher than LiCl, but covalent character BeF2 > CaF2 > SrF2 is actually correct too — yet only one option is the intended single answer matching the standard trend.

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