II-A (alkaline earth metals) and II-B (zinc f | vedclass

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(C) $MgSO_4 \cdot 7H_2O$ is isomorphous with $ZnSO_4 \cdot 7H_2O$ because they share the same crystal lattice structure.$II-A$ group cations (like $Mg

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Both $(A)$ and $(B)$

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(C) $MgSO_4 \cdot 7H_2O$ is isomorphous with $ZnSO_4 \cdot 7H_2O$ because they share the same crystal lattice structure.$II-A$ group cations (like $Mg^{2+}$,$Ca^{2+}$) are not precipitated by $H_2S$ in acidic medium,and $II-B$ group cations (like $Zn^{2+}$) are also not precipitated by $H_2S$ in acidic medium (they require a basic medium or specific conditions to precipitate as sulfides).Therefore,both statements $(A)$ and $(B)$ are correct.

$II-A$ (alkaline earth metals) and $II-B$ (zinc family) resemble in which of the following properties?

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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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