Correct order of polarising power is:

C s^{+} < K^{+} < M g^{2 +} < A l^{3 +}

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A l^{3 +} < M g^{2 +} < K^{+} < C s^{+}

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M g^{+} < A l^{3 +} < K^{+} < C s^{+}

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K^{+} < C^{+} < M g^{2 +} < A l^{3 +}

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Solution

The correct option is A $C s^{+} < K^{+} < M g^{2 +} < A l^{3 +}$
According to Fajan's rule, higher the charge on the cation, more is its polarizing power. The next factor which is considered is the size of the cation. Smaller the size of the cation, higher is its polarizing power. Hence, the order of polarizing power is $C s^{+} < K^{+} < M g^{2 +} < A l^{3 +}$ .

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Similar questions

$N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is

N a^{+}

M g^{2 +}

A l^{3 +}

S i^{4 +}

{N a}^{+}, {C a}^{2 +}, {M g}^{2 +}, {A l}^{3 +}

{C a}^{2 +} < {N a}^{+} < {M g}^{2 +} < {A l}^{3 +}

K^{+}, N a^{+}, A l^{3 +} and M g^{2 +}

L i^{+}, M g^{2 +}, K^{+}, A l^{3 +}

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