AIIMS 2019 Chemistry Oxidation States MCQ Question
Which element can have oxidation state from 4 to 6 ?
Fe
Mg
Co
Cr
Correct Answer
Detailed Explanation
Chromium (Cr) exhibits a range of oxidation states from +1 to +6 due to its electron configuration, allowing it to lose varying numbers of electrons from its 4s and 3d orbitals. The oxidation states of +4, +5, and +6 are particularly common in compounds such as CrO₂, Cr₂O₅, and CrO₃, respectively, where chromium is involved in different chemical reactions and bonding scenarios. Since the question specifically states that chromium can have oxidation states from +1 to +6, option A is correct as it aligns with this information. Other options are not applicable as they do not provide relevant information regarding chromium's oxidation states.
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