Which one of the following compounds has oxidation state of chromium other than +6?
Correct answer: B. K2Cr2O4
- A. K4CrO4
- B. K2Cr2O4
- C. Cr2O6
- D. CrCl3
Explanation
Chromium is in the +3 oxidation state. Each oxygen atom contributes -2, and there are two oxygen atoms per chromium atom, so in total, the oxygen atoms contribute -4. Since the compound is neutral, the oxidation state of chromium must balance the charge, resulting in +3 for each chromium atom.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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