Question

Lattice energy of beco3(i), mgco3(ii) and caco3(iii) is in order:



  a.   i < ii < iii



  b.   i > ii > iii



  c.   i < iii < ii



  d.   ii < i < iii

Answer 1

lattice energy= square of charge/ radius ,means that more the radius less will be the lattice enthalpy option(b)

Answer 2

Lattice energy of $BeCO_3$(i), $MgCO_3$(ii) and $CaCO_3$(iii) is in order i < ii < iii.

Explanation:

• Lattice energy is defined as the energy released when formation of 1 mole of an ionic compound occurs due to the combination of its constituent ions.  

• When we move down a group, size of the elements tend to increase due to which distance between nucleus and valence electrons increases. As a result, it becomes easier to remove an electron and ionic electron increases.

• Calcium can easily lose electrons due to which it can easily change into ionic form. This means calcium when donates its valence electrons to the carbonate then it has high ionic character.

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