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Atomic Radius

Which of the ...

Question

Which of the following is the correct order of hydration energy?

F e^{2 +} > F e^{3 +}

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C u^{2 +} < C u^{+}

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K^{+} > C s^{+}

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F^{-} < B r^{-}

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Solution

The correct option is A $K^{+} > C s^{+}$
We know that hydration enthalpy is inversely proportional to the ionic radii.
Consider the options:-
A) $F e^{2 +} > F e^{3 +}$ - Incorrect, since $F e^{2 +}$ is larger than $F e^{3 +}$ .
B) $C u^{2 +} < C u^{+}$ - Incorrect, since $C u^{2 +}$ is smaller than $C u^{+}$ .
C) $K^{+} > C s^{+}$ - Correct. $K^{+}$ is smaller than $C s^{+}$ .
D) $F^{-} < B r^{-}$ - Incorrect, since $F^{-}$ is smaller than $B r^{-}$ .
Hence, option C is the right answer.

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