Question

Considering only lattice enthalpy, arrange them in the increasing order of their stability:
$NaCl$ , $MgC{l}_2$ , $MgO$

• A. $NaCl$ , $MgO$, $MgC{l}_2$
• B. $NaCl$ , $MgC{l}_2$ , $MgO$
• C. $MgCl$, $MgO$, $MgC{l}_2$
• D. none of these

Answer 1

The correct option is B $NaCl$ , $MgC{l}_2$ , $MgO$

Lattice enthalpy is a measure of the strength of the forces between the ions in an ionic solid. The greater the lattice enthalpy, the stronger the forces.

Lattice enthalpy of $NaCl$ = $787kJ/mol$

Lattice enthalpy of $MgO$ = $3826kJ/mol$

Lattice enthalpy of $Mg{Cl}_2$= $+2534kJ/mol$