question_answer

                Electron gain enthalpy with negative sing of fluorine is less than that of chlorine due to:                   JEE Main Online Paper (Held On 09 April 2013)

A)                 High ionization enthalpy of fluorine                

B)                 Smaller size of chlorine atom                

C)                 Smaller size of fluorine atom                

D)                 Bigger size of \[2p\]orbital of fluorine

Correct Answer: C

Solution :

                Due to smaller size and high repulsive force within the outermost orbit of fluorine electron will feel less repulsion.