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NaCl is non-volatile but HCl is volatile...

NaCl is non-volatile but HCl is volatile-explainwith reason.

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The volatility of a compound depends on its boiling point which in turn depends on the intermolecular attractive forces. The only attractive force that operates among the polar covalent HCl molecules is dipole-dipole attraction. Since this attactive force is relatively weak, the boiling point of HCl is low and it is volatile (at ordinary temperature, it is a gas). on the other hand, inthe electrovalent compound NaCl, the oppositely charged `Na^(+) and Cl^(-)` ions are held together by strong electrostatic forces of attraction in the crystal lattice and because ofthis, at ordinary temperature NaCl is an non-volatile solid.
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Knowledge Check

  • This question has statement I and II. Of the four choices given after the statements, choose the one that best describes the two statements. Statement - I : The boiling point of 0.1 M urea solution is less than that of 0.1 M KCI solution. Statement -II : Elevation of boiling point is directly proportional to the number of moles of non-volatile solute particles present in the solution.

    A
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    B
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    C
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    D
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    A
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    B
    Boiling point is less
    C
    Freezing point is less
    D
    freezing point is more

  • In which of the following purification methods, the metal is first converted into its volatile compound and then it is decomposed to give the pure metal-

    A
    heating in a current of `CO`
    B
    heating with iodine
    C
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    D
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