Which of the following is arranged in an increasing order of hydration energy?

$C u^{2 +} < F e^{3 +} < F e^{2 +} < A l^{3 +}$

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$F e^{2 +} < C u^{2 +} < A l^{3 +} < F e^{3 +}$

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$A l^{3 +} < F e^{3 +} < F e^{2 +} < C u^{2 +}$

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$F e^{3 +} < A l^{3 +} < C u^{2 +} < F e^{2 +}$

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Solution

The correct option is B
$F e^{2 +} < C u^{2 +} < A l^{3 +} < F e^{3 +}$

Smaller size, greater positive charge higher the hydration energy.

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