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Which has maximum polarising power?

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a
Na+
b
Mg2+
c
Al3+
d
Si4+

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detailed solution

Correct option is D

By Fajan's rule, smaller the size of cation, larger the size of anion, larger the charge on the ion. d,f-electrons present then, larger the polarising power and larger the distortion hence, larger the covalent nature of compounds. Si" with largest charge and smallest size has maximum polarising power.

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