1.

The correct order of the lattice energies of the following ionic compounds is(a) NaCl > MgBr2 > CaO > Al2O3(b) NaCl > CaO > MgBr2 > Al2O3(c) Al2O3 > MgBr2 > CaO > NaCl(d) Al2O3 > CaO > MgBr2 > NaCl

Answer»

Answer is : (d) Al2O3 > CaO > MgBr2 > NaCl

Lattice energy is defined as the amount of energy required to completely seperate one mole of a solid ionic compound into gaseous constituent ions.

It is directly proportional to the charge of the ions. Thus, greater the ionic charge, larger is the lattice energy.

Hence, correct order is Al2O3 > CaO > MgBr2 > NaCl



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