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Question

Polarising action of $$Cd^{2+}$$ an anions is stronger than that of $$Ca^{2+}$$ 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 $$Ca^{2+}$$ ion has a noble-gas electron configuration, and the $$Cd^{2+}$$ 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 $$ ({ Cd }^{ 2+ })$$ has atronger polarsing power than $$ ({ Ca }^{ 2+ })$$ due to the above stated fact $$ ({ Cd }^{ 2+ })$$ has 18 electrons configration where as $$ ({ Cd }^{ 2+ }) $$ ion has an noble gas configration ( 8 electron shell).

Chemistry

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