How is ClO4- nonpolar, but has polar bonds?

Oh, so it has something to do with electronegativity? How do I know when to apply electronegativity?

Answer 1

its non-polar because it has four equal strength bonds. Another non-polar example would be C(OH4).

Answer 2

the bonds are polar because oxygen is more electronegative than Chlorine …but all 4 polar bonds’ polarities cancel out as they are have tetrahedral shape

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