InterviewSolution
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InterviewSolution
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(a) Account for the following observations: (i) Hydrogen fluoride has higher boiling point than hydrogen chloride.(ii) Nitrogen is fairly inert gas. (b) Draw the molecular structure of peroxomonosulphuric acid. |
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Answer» Solution :(a) (i) The boiling point of HF is higher than that of HCl. This is DUE to strong hydrogen bonding in HF because of larger electronegativity of fluorine. As a result of hydrogen bonding in HF, it exists as ASSOCIATED molecule, `(HF)_n` . Therefore, its boiling point is HIGH. `underset((HF)_n)(H-F.......H-F.......H-F..........H-F......)` However, in HCI, hydrogen bonding is negligible due to low electronegativity and large size of Cl atom. CONSEQUENTLY, its boiling point is low. (ii) In MOLECULAR nitrogen, there is a triple bond between two nitrogen atoms `(N -= N)`and it is nonpolar in character. Due to the presence of a triple bond, it has very high bond dissociation energy (945 kJ `"mol"^(-1)`) and, therefore, it does not react with other elements under normal conditions and is very unreactive. However it may react at higher temperature. (b) Molecular structure of peroxomonosulphuric acid `(H_2SO_3)`is : 
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