Which one is least ionic in the following compounds

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${BaCl}_{2}$

$KCl$

${CaCl}_{2}$

$AgCl$

answer is A.

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Detailed Solution

Among the given compounds the least ionic is AgCl.

The ionic characteristics decrease as we move from left to right in the periodic table and it increases as we move top to bottom in any group.
Here Ag is the d-block element and it forms least ionic compound whereas K, Ba, and Ca are the s-block element and form an ionic compound.

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