Question

Given ionisation enthalpy of element E(g) is 300 kJ/mol and electron gain enthalpy of A, B, C and D gaseous atoms are –320 kJ/mol, –340 kJ/mol, –200 kJ/mol and – 250 kJ/mol, then what will be the correct order of ionic nature of compounds? 

(1) EB > EA > ED > EC 

(2) EB > EA > EC > ED 

(3) EC > ED > EA > EB 

(4) EC > ED > EB > EA

Answer 1

Since ionic strength depends on IE of electropositive atom; E.G.E. of electronegative element and lattice energy, more the negative value of electron gain enthalpy, more will be ionic nature.