Correct order of polarising power is - Vidyadip

MCQ

Correct order of polarising power is

✓
$C{s^ + } < {K^ + } < M{g^{2 + }} < A{l^{3 + }}$
B
${K^ + } < C{s^ + } < M{g^{2 + }} < A{l^{3 + }}$
C
$C{s^ + } < {K^ + } < A{l^{3 + }} < M{g^{2 + }}$
D
${K^ + } < C{s^ + } < A{l^{3 + }} < M{g^{2 + }}$

✓

Answer

Correct option: A.

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

a
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 $Cs ^{+}\,<\, K ^{+}\,<\, Mg ^{2+}\,<\, Al ^{3+}$.

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