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The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K+,Ca2+,Mg2+,Be2+ ?


( A ) Be2+<K+<Ca2+<Mg2+
( B ) K+<Ca2+<Mg2+<Be2+
( C ) Mg2+<Be2+<K+<Ca2+
( D ) Ca2+<Mg2+<Be2+<K+

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