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The correct order of decreasing ionic ch...

The correct order of decreasing ionic character is

A

`BaCl_(2) gt CaCl_(2) gt MgCl_(2) gt BeCl_(2)`

B

`BaCl_(2) gt MgCl_(2) gt CaCl_(2) gt BeCl_(2)`

C

`BeCl_(2) gt MgCl_(2) gt CaCl_(2) gt BaCl_(2)`

D

`BaCl_(2) gt BeCl_(2) gt CaCl_(2) gt MgCl_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Apply Fajans's rule, charge on the cation is same and tha anion is common in all the compounds, so the size of cation will decide the ionic character or the ionic character down group `2`, increases. So, the order is as given in (a).
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According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases. The correct order of increasing ionic character is

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Knowledge Check

  • The correct order of decreasing ionic character of PbF_(2),PbCl_(2),PbBr_(2) and PbI_(2) are

    A
    `PbF_(2) gt PbCl_(2) gt PbBr_(2) gt PbI_(2)`
    B
    `PbF_(2) gt PbBr_(2) gt PbCl_(2) gt PbI_(2)`
    C
    `PbF_(2) lt PbCl_(2) lt PbBr_(2) lt PbI_(2)`
    D
    `PbF_(2) lt PbCl_(2) gt PbBr_(2) gt PbI_(2)`

  • The correct order of increasing ionic character is

    A
    `Be Cl _(2) lt Mg Cl_(2) lt CaCl_(2) lt BaCl_(2)`
    B
    `Be Cl_(2) lt MgCl_(2) lt BaCl_(2)lt CaCl_(2)`
    C
    `BeCl_(2) lt BaCl_(2) lt MgCl_(2) lt CaCl_(2)`
    D
    `BaCl_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)`

  • According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . The correct order of increasing ionic character is

    A
    `BeCl_(2) lt MgCl_(2) lt CaCl_(2) lt BaCl_(2)`
    B
    `BeCl_(2) lt MgCl_(2) lt BaCl_(2) lt CaCl_(2)`
    C
    `BeCl_(2) lt BaCl_(2) lt MgCl_(2) lt CaCl_(2)`
    D
    `BaCl_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)`

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