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The correct order of decreasing polarisable ions is:
A
Cl⁻ > Br⁻ > I⁻ > F⁻
B
F⁻ > I⁻ > Br⁻ > Cl⁻
C
F⁻ > Cl⁻ > Br⁻ > I⁻
D
I⁻ > Br⁻ > Cl⁻ > F⁻
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