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According to Fajan's rules, the maximum ...

According to Fajan's rules, the maximum ionic character is favored by

A

small cation, large anion, high charge on ions

B

large cation, large anion, low charge on ions

C

small cation, small anion, high charge on ions

D

small anion, large cation, low charge on ions

Text Solution

Verified by Experts

The correct Answer is:
D
The smaller the polarizing power of cation and the smaller the polarizability of anion, the greater the ionic character of the bond. Polarizing power of cation is directly related to its charge but inversely related to its size. Polarizability of anion is directly related to its size as well as its charge. Thus, small anion, large cation, and low charge on ions lead to minimum ionic character. On the other hand, maximum covalent character will be favored by small cation, large anion, and high charge on ions.
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Knowledge Check

  • According to Fajan's rule ionic character increases for

    A
    Large cation and small anion
    B
    Small cation and small charge on cation
    C
    Small cation and large charge on cation
    D
    Large cation and no charge on cation

  • Least ionic character is found in

    A
    Mg
    B
    Sr
    C
    Ca
    D
    Ra

  • Hydride which have maximum ionic character is

    A
    CsH
    B
    NaH
    C
    `BeH_(2)`
    D
    LiH

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