(a) Write the balanced chemical equations for obtaining and from
(b) Account for the following :
(i) is less acidic than .
(ii) has reducing nature.
(iii) is an air pollutant.
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(b) (i) In the group with increase in size of the element and increased bond distance, the bond dissociation energy decreases, therefore H-S bond dissociation energy is higher than H-Te and hence H-S bond breaks less easily than H-Te bond and H2S is a weaker acid than .
(ii) Because it contains two P-H bonds and thus reduces to metallic silver
(iii) is a pungent and irritating gas. It acts as an air pollutant due to the following reasons :
1) It causes throat and eye irritation as it is absorbed readily by respiratory tract.
2) 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.