The order of decreasing polarity in the compound $C a O, C s F, K C l, M g O$ is:

C a O, C s F, K C l, M g O

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M g O, K C l, C a O, C s F

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K C l, C a O, C s F, M g O

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C s F, K C l, C a O, M g O

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Solution

The correct option is C $C s F, K C l, C a O, M g O$
According to Fajan's rule, polarity increases as the size of the cation increases. Thus, the order of polarity is $C s F > K C l > C a O > M g O$ .

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