Select the correct order of polarising power of cation.

N a^{+} > M g^{+ 2} > A l^{+ 3} > S i^{+ 4}

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S i^{4 +} > A l^{3 +} > M g^{2 +} > N a^{+}

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A l^{3 +} > M g^{2 +} S i^{4 +} > N a^{+}

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M g^{2 +} > A l^{3 +} > S i^{4 +} > N a^{+}

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Solution

The correct option is C $S i^{4 +} > A l^{3 +} > M g^{2 +} > N a^{+}$
Polarising power is the tendency of anion to become polarized by the cation is known as polarizability.
$\to$ Higher the charge, high the polarising power.
Then the order ${S i}^{+ 4} > {A l}^{+ 3} > {M g}^{+ 2} > {N a}^{+ 1}$

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