What is the common oxidation state of Chromium in chromates?

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Question: What is the common oxidation state of Chromium in chromates?

Options:

Correct Answer: +6

Solution:

Chromium commonly exhibits a +6 oxidation state in chromates (CrO4^2-).

What is the common oxidation state of Chromium in chromates?

What is the common oxidation state of Chromium in chromates?

Step 1: Understand what oxidation state means. It refers to the charge of an atom in a compound.
Step 2: Identify the compound in question, which is chromate (CrO4^2-).
Step 3: Note that in chromate, the overall charge is -2.
Step 4: Recognize that oxygen typically has an oxidation state of -2.
Step 5: Calculate the total oxidation state contributed by the four oxygen atoms: 4 oxygen atoms × -2 = -8.
Step 6: Set up the equation for the total charge: Chromium's oxidation state (x) + total oxygen charge (-8) = overall charge (-2).
Step 7: Solve the equation: x - 8 = -2, which means x = +6.
Step 8: Conclude that the common oxidation state of Chromium in chromates is +6.

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