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Question

Polarising action of Cd2+ on anion is stronger than that of Ca2+ because:

A
The charges of the ions are same
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B
Their radii are same (Ca2+=0.104nm;Cd2+=0.099nm)
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C
The Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion, an 18 electron configuration of its outer shell
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D
All of the above are correct
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Solution

The correct option is C The Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion, an 18 electron configuration of its outer shell
Polarising action of Cd2+ on anion is stronger than that of Ca2+ because the Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion, an 18 electron configuration of its outer shell. A cation with 18 valence electrons has more polarizing power than a cation with 8 valence electrons.

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