Question

Statement 1: $F$ atom has a less negative electron gain enthalpy than $Cl$ atom.
Statement 2: Additional electron is repelled more efficiently by $3p$ electron in $Cl$ atom than by $2p$ electron in $F$ atom.

• A. Both the statements are correct and statement 2 is the correct explanation of statement 1
• B. Both the statements are correct and statement 2 is not the correct explanation of statement 1
• C. Statement 1 is true and statement 2 is false
• D. None of the statements are true

Answer 1

The correct option is C Statement 1 is true and statement 2 is false

The additional electron is repelled more efficiently by $2p$ electron in $F$ atom than by $3p$ electron in $Cl$ atom due to the smaller size of $F$ atom (there are more inter-electronic repulsions). This is the reason why electron gain enthalpy of $F$ is less negative than that of $Cl$.