What is the common oxidation state of chromium in CrO3? (2023)

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Question: What is the common oxidation state of chromium in CrO3? (2023)

Options:

Correct Answer: +6

Exam Year: 2023

Solution:

In CrO3, chromium (Cr) has an oxidation state of +6.

What is the common oxidation state of chromium in CrO3? (2023)

What is the common oxidation state of chromium in CrO3? (2023)

Step 1: Identify the compound CrO3. It consists of chromium (Cr) and oxygen (O).
Step 2: Know that oxygen typically has an oxidation state of -2.
Step 3: In CrO3, there are three oxygen atoms. So, calculate the total oxidation state contributed by oxygen: 3 oxygen atoms × -2 = -6.
Step 4: Let the oxidation state of chromium be x. The total oxidation states in the compound must equal zero because it is neutral.
Step 5: Set up the equation: x (oxidation state of Cr) + (-6) (total from O) = 0.
Step 6: Solve for x: x - 6 = 0, so x = +6.
Step 7: Conclude that the common oxidation state of chromium in CrO3 is +6.

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