What is the correct order of melting point?

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Question

(A) The melting point of ionic compounds depends on the lattice energy,which is inversely proportional to the interionic distance. For alkaline earth

Vedclass · Accepted Answer

$BeO > MgO > CaO > SrO$

Vedclass · Answer

(A) The melting point of ionic compounds depends on the lattice energy,which is inversely proportional to the interionic distance. For alkaline earth metal oxides $(BeO, MgO, CaO, SrO)$,as the size of the cation increases down the group,the lattice energy decreases,leading to a decrease in the melting point. Thus,the order $BeO > MgO > CaO > SrO$ is correct. In option $B$,the order is incorrect because $CaCl_2$ has a higher melting point than $SrCl_2$. In option $C$,the order is incorrect as $Al_2O_3$ has the highest melting point due to high lattice energy.

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What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?

$Mg(NO_3)_2 \cdot XH_2O$ and $Ba(NO_3)_2 \cdot YH_2O$ represent the formulas of the crystalline forms of nitrate salts. The sum of $X$ and $Y$ is $.........$.

The setting of Plaster of Paris is associated with which of the following?

Assertion $(A)$: $MgO$, $CaO$, $SrO$, and $BaO$ are insoluble in water.
Reason $(R)$: In aqueous medium, the basic strength of $MgO$, $CaO$, $SrO$, and $BaO$ increases with an increase in the atomic number of the metal.
The correct option among the following is:

Statement $A$: Calcium chloride $(CaCl_2)$ is not useful for drying alcohols or $NH_3$.
Reason $R$: $CaCl_2$ is not a good desiccant.

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