Which one is the most ionic?

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${CrO}_{3}$

$MnO$

$P_{2} O_{5}$

${Mn}_{2} O_{7}$

answer is C.

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Detailed Solution

The magnitude of the positive charge is directly proportional to polarization power.
- MnO has the highest magnitude of positive charge hence MnO is the most ionic compound.
- In the determination of ionic character, the electronegativity of the two atoms is involved. The greater the difference, the more the ionic character in the bond.

So, option C is correct.

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