Problem: What is the oxidation number of the chromium atom in Na2CrO4 ?A) +7 B) +6 C) -2 D) +2

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We’re being asked to determine the oxidation state of Cr in Na2CrO4


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


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Problem Details

What is the oxidation number of the chromium atom in Na2CrO?

A) +7 

B) +6 

C) -2 

D) +2


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