What is the oxidation number of the chromium atom in the compound, BaCr₂O₇?

Question

Quizplus · Accepted Answer

The compound formula indicates that there are four sulfide ions, which have a charge of -2 each for a total charge of -8. The barium ion has a charge of +2, so the total charge must be balanced by the chromium and oxygen ions. Setting up the equation:

2(+2) + x + (-8) + 1(+7) + 2(-1) = 0

where x is the oxidation number of chromium. Simplifying:

x - 1 = 0

x = +1

Therefore, the oxidation number of the chromium atom in the compound is +6 (choice C).

What Is the Oxidation Number of the Chromium Atom in the Compound