JEE Main Chemistry question

Which of the following metals exhibits more than one oxidation state?

(A)Na
(B)Mg
(C)Al
(D)FeCorrect

Answer: (D)

Solution

Na, Mg and Al are main-group metals that show only one fixed oxidation state (+1, +2 and +3 respectively) because they simply lose all valence electrons. Fe is a transition element with

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Question ID VK-133294