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Q.

Cation is not Isoelectronic with Anion in 

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a

Al F3

b

CaCl2

c

KF 

d

NaF

answer is A.

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Detailed Solution

Isoelectronic species are those which contain the same number of electrons.
If cation and anion do not contain the same electrons, they are not isoelectronic.
Cation is not isoelectronic with anion in KF, because the cation K+ contains 18 electrons whereas, the anion F− contains 10 electrons. Remaining all other molecules contain the same number of electrons in the cation as well as the anion.

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