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The order of decreasing polarity in the compounds CaO, CsF, KCl, MgO is

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The order of decreasing polarity in the compounds CaO, CsF, KCl, MgO is 

(a)  CaO, CsF, KCl, MgO

(b)  MgO, KCl, CaO, CsF,

(c)  KCl, CaO, CsF, MgO

(d)  CsF, KCl, CaO, MgO

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Correct option  (d) CsF, KCl, CaO, MgO

Explanation:

According to Fajan rules, polarity increases as the size of the cation increases.

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