Q. 13

Give reasons <spa

Answer :

(i)


• The boiling point of NH3 is greater than that of PH3 because of the presence of hydrogen bonding in ammonia.


• Unlike NH3, the atoms in PH3 molecule is not associated through hydrogen bonding in the liquid state.


• Thus, the boiling point of NH3 is higher than that of PH3.


(ii)


• The bond dissociation energy of H2Te is lesser compared to that of H2S. This is because of the strong bonds between hydrogen and sulphur which hold the molecule together.


• Thus, lesser energy is required to break H2Te and release H+ ions and hence the acidity of H2Te is higher than H2S.


(iii)


• Chlorine water has a characteristic yellow colour. But upon standing it loses this colour because it gets converted into Hypochlorous acid and Hydrochloric acid on exposure to sunlight.


• This process is given by the following equation


Cl2 + H2O HOCl(aq) + HCl(aq)


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