Question

What causes decrease in polarising power of the ions .​

Answer 1

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Answer:

In the large anion, the nucleus exerts a weak force on the electrons in the outermost shell. So, the electron cloud can become easily distorted. Atoms and ions causing the large distortions are said to have high polarizing power. A small and highly charged cation is said to have high polarizing power.

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Answer 2

Answer:

Small cation: the high polarizing power stems from the greater concentration of positive charge on a small area. ... Large charges: as the charge on an ion increases, the electrostatic attractions of the cation for the outer electrons of the anion increases, resulting in the degree of covalent bond formation increasing.

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