Question

which is having high lattice energy 1,Licl2,Mgcl3,Nacl4,cscl​

Answer 1

Answer:

MgOMgO (≈3800≈3800 kJmol−1kJmol−1) has higher lattice energy than LiFLiF (≈1045≈1045 kJmol−1kJmol−1) mainly because of the greater charge on Mg2+MgX2X+ ion and O2−OX2− as lattice energy is directly proportional to the charges of the combing atoms.

Your reasoning isn't incorrect but remember that LiLi and MgMg show diagonal relationship so the size of their ions has only slight difference in magnitude. Similarly, oxygen and fluorine are placed next to each other in the periodic table so their anions don't have a large difference in size.

Thus, the "charge factor" dominates. SOME WORDS IS INCORRECT MGCL3,NGCL4