In which one of the following sets of chromium-containing compounds do the chromium atoms all have the same oxidation number?
A - VCE - SSCE Chemistry - Question 15 - 2005 - Paper 1
Question 15
In which one of the following sets of chromium-containing compounds do the chromium atoms all have the same oxidation number?
A. Cr₂O₃, K₃Cr₂O₇, Na₃CrO₄
B. CrCl₂, C... show full transcript
Worked Solution & Example Answer:In which one of the following sets of chromium-containing compounds do the chromium atoms all have the same oxidation number?
A - VCE - SSCE Chemistry - Question 15 - 2005 - Paper 1
Step 1
A. Cr₂O₃, K₃Cr₂O₇, Na₃CrO₄
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Answer
In Cr₂O₃, chromium is in the +3 oxidation state. In K₃Cr₂O₇, chromium is in the +6 oxidation state, and in Na₃CrO₄, chromium is also in the +6 oxidation state. Therefore, not all chromium atoms have the same oxidation number.
Step 2
B. CrCl₂, Cr₂O₃, K₂Cr₂O₇
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Answer
In CrCl₂, chromium is in the +2 oxidation state. In Cr₂O₃, chromium is in the +3 oxidation state, and in K₂Cr₂O₇, chromium is in the +6 oxidation state. Therefore, not all chromium atoms have the same oxidation number.
Step 3
C. Cr₂O₃, CrCl₃, Cr(NO₃)₃
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Answer
In Cr₂O₃, chromium is in the +3 oxidation state. In CrCl₃, chromium is also in the +3 oxidation state. In Cr(NO₃)₃, chromium remains in the +3 oxidation state. Therefore, all chromium atoms have the same oxidation number.
Step 4
D. Na₂CrO₄, Cr₂O₃, Cr(NO₃)₃
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Answer
In Na₂CrO₄, chromium is in the +6 oxidation state. In Cr₂O₃, chromium is in the +3 oxidation state, and in Cr(NO₃)₃, it is in the +3 oxidation state. Therefore, not all chromium atoms have the same oxidation number.
