11th Class Chemistry Chemical Bonding and Molecular Structure Question Bank 11th CBSE Chemistry Chemical Bonding and Molecular Structure

  • question_answer Why is\[HCl\]predominantly covalent in the gaseous state but is ionic in aqueous solution?

    Answer:

                    In\[HCl\], the electro negativity difference in \[Cl\] and H atoms (3.0 - 2.1) is 0.9. Therefore, it is predominantly covalent in the gaseous state. When dissolved in water which is of polar nature, there is an attraction between the atoms of the acid and polar\[{{H}_{2}}O\] molecules. Energy is released during attraction. This helps in the ionisation of the acid. Therefore, \[HCl\] is ionic in aqueous solution.


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