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According to Fajans'rules, the percentag...

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 decreasing covalent character is

A

`LiClgtNaClgtBeCl_(2)`

B

`BeCl_(2)gtLiClgtNaCl`

C

`NaClgtLiClgtBeCl_(2)`

D

`BeCl_(2)gtNaClgtLiCl`

Text Solution

Verified by Experts

The correct Answer is:
B
With the increase in size of cation, covalent character increases.
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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. Which of the following has the lowest melting point?

Knowledge Check

  • 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

    A
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    B
    `NaCl lt KCl lt CsCl lt RbCl`
    C
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    D
    `CsCl lt RbCl lt KCl lt NaCl`

  • 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

    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
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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. Which of the following has highest melting point?

    A
    `LiCl`
    B
    `NaCl`
    C
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    D
    `RbCl`

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