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 is

Answer» <html><body><p>`BeCl_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>) lt MgCl_(2) lt CaCl_(2) lt BaCl_(2)`<br/>`BeCl_(2) lt MgCl_(2) lt BaCl_(2) lt CaCl_(2)`<br/>`BeCl_(2)lt BaCl_(2) lt MgCl_(2) lt CaCl_(2)`<br/>`BaCl_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)`</p>Solution :As the size of the <a href="https://interviewquestions.tuteehub.com/tag/cation-910854" style="font-weight:bold;" target="_blank" title="Click to know more about CATION">CATION</a> increases , electronegativity decreases but the electronegativity <a href="https://interviewquestions.tuteehub.com/tag/difference-951394" style="font-weight:bold;" target="_blank" title="Click to know more about DIFFERENCE">DIFFERENCE</a> increases and hence <a href="https://interviewquestions.tuteehub.com/tag/ionic-1051191" style="font-weight:bold;" target="_blank" title="Click to know more about IONIC">IONIC</a> <a href="https://interviewquestions.tuteehub.com/tag/character-914164" style="font-weight:bold;" target="_blank" title="Click to know more about CHARACTER">CHARACTER</a> increases accordingly , i.e., option (a) is correct .</body></html>


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