Question

# Polarising action of $$Cd^{2+}$$  on anion is stronger than that of $$Ca^{2+}$$ because:

A
The charges of the ions are same
B
C
The Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion, an 18 electron configuration of its outer shell
D
All of the above are correct

Solution

## The correct option is C The $$Ca^{2+}$$ ion has a noble-gas electron configuration, and the $$Cd^{2+}$$ ion, an 18 electron configuration of its outer shellPolarising action of $$Cd^{2+}$$  on anion is stronger than that of $$Ca^{2+}$$ because the $$Ca^{2+}$$ ion has a noble-gas electron configuration, and the $$Cd^{2+}$$ 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.Chemistry

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