# Problem: What is the oxidation state of each element in K 2Cr2O7?

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###### FREE Expert Solution

We’re being asked to determine the oxidation state of each element in K2Cr2O7 (potassium dichromate).

The rules for oxidation states are as follows:

A. General Rules:

1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.)    O.S. = 0

2. For an ion (Li+, Al3+, etc.)                                                       O.S. = charge

B. Specific Rules:

1. Group 1A              O.S. = +1

2. Group 2A              O.S. = +2

3. Hydrogen              O.S. = +1, with nonmetals

O.S. = –1 with metals and boron

4. Fluorine                 O.S. = –1

5. Oxygen                  O.S. = –1 in peroxides (X2O2, X = Group 1A)

O.S. = –1/2 in superoxides (XO2, X = Group 1A)

O.S. = –2 in other compounds

6. Group 7A               O.S. = –1 (except when bonded to O)

95% (140 ratings)
###### Problem Details

What is the oxidation state of each element in K 2Cr2O7?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Calculate Oxidation Numbers concept. You can view video lessons to learn Calculate Oxidation Numbers Or if you need more Calculate Oxidation Numbers practice, you can also practice Calculate Oxidation Numbers practice problems .

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Based on our data, we think this problem is relevant for Professor Price's class at MARSHALL.