(a) Write any two anomalous properties of fluorine.
(b) Give an equation for the reaction of chlorine with hydrogen sulphide.

Explanation

(a)Fluorine has high ionization enthalpy, high electronegativity and high value of electrode potential.
(ii) The ionic and covalent radii, bond dissociation enthalpy and negative electron gain enthalpy are quite low.
(iii) It forms only one oxoacid while other halogens form a number of oxoacids.
(iv) Hydrogen fluoride is a liquid due to strong intermolecular hydrogen bonding while other hydrogen halides are gases.
The anomalous behavior of fluorine is due to its small size, highest electronegativity, low F-F bond dissociation enthalpy and non-availability ofd-orbitals in its valence shell.
(b)`H_(2)S + Cl_(2) rarr S + 2HCI`