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Lithium fluroide (LiF) is mainly ionic b...

Lithium fluroide `(LiF)` is mainly ionic but lithium iodide `(LiI)` is covalent in nature. Assign reason.

Text Solution

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`I^(-)` ion has a bigger size than the `F^(-)` ion. It can be more readily polarised by `Li^(+)` ion than by `F^(-)` ion. As a result, `Li^(+) " and " I^(-)` ions come quite close and neutralise their charge to a large extent resulting in covalent compound. On the other hand, `Li^(+) " and " F^(-)` ions are not in a position to neutralise their charge and `LiF` is mainly ionic.
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Knowledge Check

  • Assertion (A): LiF is ionic in nature. Reason (R): Lil is covalent in nature.

    A
    Both A and Rare true and R is the correct explanation of A
    B
    Both A and R are true but R is not the correct explanation of A
    C
    A is true but R is false
    D
    A is false but Ris true

  • Lithium iodide is more covalent than lithium chloride due to

    A
    smaller lithium ion
    B
    smaller iodide ion
    C
    larger lithium ion
    D
    larger iodide ion

  • Consider the following statements: S_(1) : Among alkali metal halides lithium iodide is the most covalent in nature. S_(2) : Potassium has greater photoelectric work function than sodium. S_(3) : The blue solution osf alkali metals in liquid ammonia is stable at room temperature, where ammonis is still a liquid, in the presence of Fe. S_(4) : The melting and boilling points of alkali metal halides always follow the trend : chloride gt flouridegtbromidegtiodide. and arrange in the order of true/iodide.

    A
    T F F F
    B
    T T F F
    C
    T F T T
    D
    T T T F

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    Given below are two statements : One is labelled as Assertion A and the other labelled as Reason R. Assertion A : Lithium halides are some what covalent in nature. Reason R : Lithium possess high polarisation capability. In the light of the above statements, choose the most appropriate answer from the options given below :

    Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because

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