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Answer the following: (a) Define latti...

Answer the following:
(a) Define lattice enthalpy.
(b) What are the important consequences of lattice enthalpy?

Text Solution

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(a) The lattice enthalpy of an ionic solid is defined as the energy required to completely separate one mole of a solid ionic compound into gaseous constituent ions.
(b) The important consequences of lattice enthalpy are :
(i) The greater the lattice enthalpy, more the stability of ionic compound.
(ii) The lattice enthalpy is greater for ions of higher charge and smaller radii.
(iii) The lattice enthalpies affect the solubilities of ionic compounds.
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Knowledge Check

  • Order of lattice enthalpy is as

    A
    `BeF_(2) gt MgF_(2) gt CaF_(2) gt SrF_(2)`
    B
    `BeF_(2) lt MgF_(2) lt CaF_(2) lt SrF_(2)`
    C
    `LiF lt LiCl lt LiBr lt Lil`
    D
    `Lil lt LiBr lt CsBr lt Csl`

  • Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

    A
    `CaSO_4`
    B
    `BeSO_4`
    C
    `BaSO_4`
    D
    `SrSO_4`

  • Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

    A
    `CaSO_(4)`
    B
    `BeSO_(4)`
    C
    `BaSO_(4)`
    D
    `SrSO_(4)`

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    Which of the following alkaline earth metal sulphates has hydration enthallpy higher than the lattice enthalpy?

    For which one of the following reaction does not the enthalpy change of a reaction corresponds to Lattice energy of KBr ?

    Which of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy ?

    Lattice enthalpy of an ionic compound depends on

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