Which of the following statements is correct?

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(D) $1$. Solubility of alkaline earth metal fluorides: $BeF_2$ is highly soluble due to high hydration energy,while $MgF_2$ is sparingly soluble. Solu

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All of the above are correct

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(D) $1$. Solubility of alkaline earth metal fluorides: $BeF_2$ is highly soluble due to high hydration energy,while $MgF_2$ is sparingly soluble. Solubility increases down the group from $MgF_2$ to $BaF_2$. Thus,$MgF_2 $2$. Thermal stability of carbonates: Thermal stability of alkaline earth metal carbonates increases down the group as the size of the cation increases. Thus,$BeCO_3 $3$. Polarising power: According to Fajan's rule,polarising power is directly proportional to charge density $(charge/size)$. $Si^{4+}$ has the highest charge density,followed by $Al^{3+}$,then $Ca^{2+}$. Thus,$SiCl_4 > AlCl_3 > CaCl_2$ is correct.$4$. Since both $(B)$ and $(C)$ are correct,the question likely intends to ask for the correct statement. Given the options,$(D)$ is the most appropriate choice if we consider the validity of the trends.

List-$I$ (Elements)	List-$II$ (Properties)
$(a)$ $Ba$	$(i)$ Organic solvent soluble compounds
$(b)$ $Ca$	$(ii)$ Outer electronic configuration $6s^2$
$(c)$ $Li$	$(iii)$ Oxalate insoluble in water
$(d)$ $Na$	$(iv)$ Formation of very strong monoacidic base

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

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