In which of the following options the order of arrangement does not agree with the variation of property indicated against it?
Al3+ > Mg2+ < Na+ < F- (increasing ionic size)
B < C < N < O (increasing first ionisation enthalpy)
I < Br < Cl < F (increasing electron gain enthalpy
Li < Na < K < Rb (increasing metallic radius)
Electron gain enthalpy -
When an electron is added to a neutral gaseous atom (x) to convert it into a negative ion, the enthalpy change accompanying the process is defined as the electron gain enthalpy
-
Ionization enthalpy -
It is defined as the minimum amount of energy required to remove the outer most shell electron from an isolated gaseous atom (X) to form the gaseous ion.
- wherein
The correct order of increasing negative electron gain ethaepy is I < Bo<F<cl and the correct order of increasing first ionisation ethalpy is B<C<O<N
Option 1)
Al3+ > Mg2+ < Na+ < F- (increasing ionic size)
This option is incorrect
Option 2)
B < C < N < O (increasing first ionisation enthalpy)
This option is incorrect
Option 3)
I < Br < Cl < F (increasing electron gain enthalpy
This option is correct
Option 4)
Li < Na < K < Rb (increasing metallic radius)
This option is incorrect