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Which one of the following compound is not made up of charged ions

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$NaC l$

$O_{2}$

$MgC l_{2}$

$CaO$

answer is A.

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Detailed Solution

NaCl, $MgC l_{2}$ and CaO are ionic compounds. Hence, they have charged ions like cation and anion $({Na}^{+}, C l^{-})$ .

But, the molecule $O_{2}$ is a covalent nature. Hence, there are no ions in it.

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