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Question

Which of the following has higher polarising power- Al3+ ,Mg+2 ,O2-?


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Solution

  1. Polarising power is defined as the extent to which a cation can polarise a given anion.
  2. Polarising power is directly proportional to charge density, i.e. charge to radius ratio.

So, from the given ions, we can conclude Al3+has the highest polarising power as it has a charge of +3.


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