Chemistryhard · Past Paper
What is the oxidation number of Cr in K2Cr2O7?
A+3
B+5
C+6
D+7
✓ Correct Answer: C — +6
2(+1) + 2(Cr) + 7(-2) = 0 => 2Cr = 12 => Cr = +6.
Share this question
More from Chemistry
- Which of the following is the most abundant metal in the Earth's crust?
- If a piece of magnesium is placed in a solution of Zinc Sulfate, what will happen?
- What is the mass of one mole of Carbon-12?
- The reaction: C + H2O (steam) -> CO + H2 produces:
- The reaction between Silver Nitrate and Potassium Iodide is an example of: