Question

In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?
(a) Al³⁺ < Mg²⁺ < Na⁺ < F⁻ (increasing ionic size)
(b) B < C < N < O (increasing first ionisation enthalpy)
(c) I < Br < Cl < F (increasing electron gain enthalpy)
(d) Li < Na < K < Rb (increasing metallic radius)

Answer 1

Answer:

In the following options the order of arrangement does not agree with the variation of property indicated against it is I < Br < Cl < F ( increasing entalphy)

Explanation:

In the following options the order of arrangement does not agree with the variation of property indicated against it is I < Br < Cl < F ( increasing entalphy)

This is because as we move down a group in the periodic table the size of the atom increases.

As the size increases the distance between the nucleus and the last orbit increases and fore of attraction decreases between the atoms.