Account for the following ;
(i) Chlorine water loses its yellow colour on standing.
(ii) is more stable than
(iii) Fluorine does not form oxoacids.
(iv) acts as an oxidising agent.
(v) is an air pollutant.
(i) water on standing loses its yellow colour due to the formation of HCl and HOCl. HOCl is unstable and decomposes to HCl. As a result, yellow colour disappears.
(ii) In can accommodate three chlorine atoms around it and hence it is stable but in , five Cl atoms cannot be accommodated around Br and hence it is unstable.
(iii) Due to high electronegativity and small size F does not form oxoacids.
(iv) In the oxidation state of phosphorus is +5. Thus, it cannot increase its oxidation state beyond +5. So cannot act as a reducing agent. However, it can decrease its oxidation state from +5 to +3 or to some lower value. Thus, it acts as an oxidising agent.
(v) is a pungent and irritating gas. It acts as an air pollutant due to the following reasons :
i) It causes throat and eye irritation as it is absorbed readily by respiratory tract.
ii) It combines with moisture forming sulphurous acid. It is then converted into Both these acids cause acid rain and destroy the marble, corrode metals, deteriorate fabrics, paper, leather etc.