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