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 isA. `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)`

According to Fajan rules , the percentage of covalent character in an

1.	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 isA. `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)`
Answer» Correct Answer - A As the size of the cation increases , electronegativity decreases but the electronegativity difference increases and hence ionic character increases accordingly , i.e., option (a) is correct .

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