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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

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

Knowledge Check

  • Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH the correct order of increasing ionic character is

    A
    `LiH gt NAH gt CsH gt KH gt RbH`
    B
    `LiH lt NaH lt KH lt RbH lt CsH`
    C
    `RbH gt CsH gt NaH gt KH gt LiH`
    D
    `NaH gt CsH gt RbH gt LiH gt KH`

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