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Question

Polarising action of Cd2+ an anions 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+ = 0.104 nm, Cd2+=0.099 nm)
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C
the Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion has an 18 electron configuration in its outer shell
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D
all of the above
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Solution

The correct option is B the Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion has an 18 electron configuration in its outer shell
Cations with 18 electrons shall have greater polarising power than the cation with 8 electron shell.
the linear electron has a poor shielding effect on the nucleus and thus E.N of the 16-electron shell is increased.
Cadmium ion (Cd2+) has atronger polarsing power than (Ca2+) due to the above stated fact (Cd2+) has 18 electrons configration where as (Cd2+) ion has an noble gas configration ( 8 electron shell).

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