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Sodium chloride solution freezes at lowe...

Sodium chloride solution freezes at lower temperature then water but boils at higher temperature than water. Explain.

Text Solution

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The freezing point of a liquid depresses on the addition of a non-volatile solute, and therefore, a solution of sodium chloride freezes at a temperature lower than the freezing point of water. On the other hand, there is elevation of boiling point on the addition of a non-volatile solute and consequently the boiling point of sodium chloride solution is more then that of water.
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Knowledge Check

  • In Shimla, water boils at lower temperature because

    A
    the atmosphere pressure is high
    B
    the atmospheric pressure is low
    C
    the temperature is low
    D
    the temperature is high

  • Sodium chloride is soluble in water not in benzene because

    A
    `Delta H_("hydration") lt Delta H_("lattice energy in water") and Delta H_("solvation") gt Delta H_("lattice energy in benzene")`
    B
    `Delta H_("hydration") gt Delta H_("lattice energy in water") and Delta H_("solvation") lt Delta H_("lattice energy in benzene")`
    C
    `Delta H_("hydration") = Delta H_("lattice energy in water") and Delta H_("solvation") lt Delta H_("lattice energy in benzene")`
    D
    `Delta H_("hydration") lt Delta H_("lattice energy in water") and Delta H_("solvation") = Delta H_("lattice energy in benzene")`

  • In anomalous expansion of water at what temperature, the density of water is maximum ?

    A
    `4^(@)C`
    B
    `lt 4^(@)C`
    C
    `gt 4^(@)C`
    D
    `10^(@)C`

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