Which of the following cations has a high polarising power? *
Be2+
Mg2+
Ca2+
Sr2+
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Answer: Ca2+Explanation:
High charge and small size of the cations increases polarisation.As the size of the given cations decreases asK+ > Ca2+ > Mg2+ > Be2+Hence polarising power decreases asK+ < Ca2+ < Mg2+ <Be2+
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