Out of list 1, select the cation which has less polarizing power than $C a^{2 +}$ and from list II, select the anion having more polarisability:
List I: $M g^{2 +}$ , $S c^{3 +}$ , $K^{+}$
List II: $O^{2 -}$ , $C l^{-}$ , $P^{3 -}$

M g^{2 +}

O^{2 +}

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K^{+}

P^{3 -}

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S c^{3 +}

P^{3 -}

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M g^{2 +}

C l^{-}

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Solution

The correct option is D $K^{+}$ , $P^{3 -}$
According to Fajan's Rule,
1) if the cation has a high charge density (small size and high charge), its polarizing power will be high.
2) if the anion is large in size, polarization will be high.
Hence, the cation with least polarizing power is $K^{+}$ and anion with maximum polarizability is $P^{- 3}$ .

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Similar questions

Which of the following sets contain only isoelectronic ions?
(i) $Z n^{2 +}, C a^{2 +}, G a^{3 +}, A l^{3 +}$

(ii) $K^{+}, C a^{2 +}, S c^{3 +}, C l^{-}$

(iii) $P^{3 -}, S^{2 -}, C l^{-}, K^{+}$

(iv) $T i^{4 +}, A r, C r^{3 +}, v^{5 +}$

The charge/ size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^{+}, C a^{2 +}, M g^{2 +}, B e^{2 +}$

Q. Which of the following species are isoelectronic?

i) N e i i) O^{2 -} i i i) M g^{2 +} i v) F

v) A l^{3 +} v i) C l^{-} v i i) K v i i i) N a

Q. Which of the following species are isoelectronic?

i) N e i i) O^{2 -} i i i) M g^{2 +} i v) F

v) A l^{3 +} v i) C l^{-} v i i) K v i i i) N a

Q. Consider the given box:

\begin{matrix} C l^{-}, A r, K^{+}, O^{2 -}, M g^{2 +}, F^{-} \end{matrix}

The total number of species which are isoelectronic with

C a^{2 +}

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Out of list 1, select the cation which has less polarizing power than Ca2+ and from list II, select the anion having more polarisability:List I: Mg2+, Sc3+, K+List II: O2−, Cl−, P3−

Out of list 1, select the cation which has less polarizing power than $C a^{2 +}$ and from list II, select the anion having more polarisability:
List I: $M g^{2 +}$ , $S c^{3 +}$ , $K^{+}$
List II: $O^{2 -}$ , $C l^{-}$ , $P^{3 -}$