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

###### FREE Expert Solution
95% (140 ratings)
###### 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 Number concept. If you need more Calculate Oxidation Number practice, you can also practice Calculate Oxidation Number practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofWhat is the oxidation state of each element in K 2Cr2O7?...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 1 minute and 23 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Learn's class at APP STATE.