Which of the following orders are correct?I. | vedclass

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(A) $I$. Thermal stability of alkaline earth metal sulfates increases down the group due to the increase in the size of the cation,which stabilizes th

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$I$,$IV$

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(A) $I$. Thermal stability of alkaline earth metal sulfates increases down the group due to the increase in the size of the cation,which stabilizes the large sulfate anion. Thus,$BeSO_4 $II$. Basic nature of oxides increases down the group as metallic character increases. $ZnO$ is amphoteric,while $BeO$ is amphoteric but less basic than $MgO$. The correct order is $ZnO $III$. Solubility of alkali metal hydroxides increases down the group due to the decrease in lattice energy being more significant than the decrease in hydration energy. Thus,$LiOH $IV$. Melting point of alkali metal halides generally decreases down the group,but $LiCl$ has a lower melting point than $NaCl$ due to its covalent character and small size. The order $NaCl > KCl > RbCl > CsCl > LiCl$ is correct. Thus,$IV$ is correct.Therefore,statements $I$ and $IV$ are correct.

Which of the following orders are correct?
$I$. Thermal stability : $BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4 < BaSO_4$
$II$. Basic nature : $ZnO > BeO > MgO > CaO$
$III$. Solubility in water : $LiOH > NaOH > KOH > RbOH > CsOH$
$IV$. Melting point : $NaCl > KCl > RbCl > CsCl > LiCl$

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Which of the following orders are correct?$I$. Thermal stability : $BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4 < BaSO_4$$II$. Basic nature : $ZnO > BeO > MgO > CaO$$III$. Solubility in water : $LiOH > NaOH > KOH > RbOH > CsOH$$IV$. Melting point : $NaCl > KCl > RbCl > CsCl > LiCl$