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JEE · NEET Previous Year Question

$Choose the correct statement. Fe^{3 +} ion is more stable than Fe^{2 +} ion because$

Topic: JEE PYQ

Answer: B. Full step-by-step solution below.

A $More the charge on the atom, more is its stability$
B $Configuration of Fe^{2 +} is 3 d^{6} while Fe^{3 +} is 3 d^{5}$
C $Fe^{2 +} has a larger size than that of Fe^{3 +}$
D $Fe^{3 +} ions are coloured$

Correct answer: B

Solution

(b) In Fe^{3 +}, the d-orbital is half-filled (d^{5})). So, it has the maximum exchange energy which, in turn, leads to extra stability over Fe^{2 +} (d^{6}) .

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