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What is the primary oxidation state of chromium in CrO3?

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Question: What is the primary oxidation state of chromium in CrO3?

Options:

  1. +2
  2. +3
  3. +6
  4. +7

Correct Answer: +6

Solution: 

In CrO3, chromium has a primary oxidation state of +6.

What is the primary oxidation state of chromium in CrO3?

Practice Questions

Q1
What is the primary oxidation state of chromium in CrO3?
  1. +2
  2. +3
  3. +6
  4. +7

Questions & Step-by-Step Solutions

What is the primary oxidation state of chromium in CrO3?
Correct Answer: +6
  • 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 3 oxygen atoms. So, calculate the total oxidation state contributed by oxygen: 3 oxygen atoms × -2 = -6.
  • Step 4: The overall charge of the compound CrO3 is neutral (0).
  • Step 5: Let the oxidation state of chromium be x. Set up the equation: x + (-6) = 0.
  • Step 6: Solve the equation for x: x - 6 = 0, so x = +6.
  • Step 7: Conclude that the primary oxidation state of chromium in CrO3 is +6.
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