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Solution


Q.

An element ‘E’ has the ionisation enthalpy value of 374 kJ mol-1. ‘E’ reacts with elements A, B, C and D with electron gain enthalpy values of –328, –349, –325 and –295 kJ mol-1, respectively.

The correct order of the products EA, EB, EC and ED in terms of ionic character is:                 [2025]
1 EA > EB > EC > ED  
2 EB > EA > EC > ED  
3 ED > EC > EA > EB  
4 ED > EC > EB > EA  

Ans.

(2)

More negative is the electron gain enthalpy value, more is non metallic character in the element and hence more is electronegativity. More is electronegativity of the element (A, B, C or D), higher will be the electronegativity difference between the element and ‘E’. More is electronegativity difference, more is ionic character. As electron gain enthalpy becomes less negative in the order: B > A > C > D, ionic character decreases in the order: EB > EA > EC > ED.