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Question

The polarising action of Cd2+ on anions is stronger than that of Ca2+ because:


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

The correct option is C The Ca2+ ion has a noble gas electronic configuration and Cd2+ ion has 18 electron configuration of its outer shell.
Ca:[Ar]4s2Ca2+:[Ar] 

So, Ca2+ has a noble gas configuration (i.e. 8 electrons in the valence shell).

Cd (atomic no. 48):[Kr]5s24d10Cd2+:[Kr]4d10
Cd2+ has 18 valence electrons or it has pseudo noble gas configuration. Cations with pseudo noble gas configuration have more polarising power than cations with nobel gas configuration.

Chemistry

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