Question

what is the formula for chromium (vi) oxide? cro₂ cr₂o cro₃ cr₂o₃

Explanation:

Step1: Determine the oxidation states

Chromium (VI) has an oxidation state of \(+6\), and oxygen has an oxidation state of \(-2\).

Step2: Use the criss - cross method

To balance the charges, we need \(x\) number of \(Cr\) and \(y\) number of \(O\) such that \(6x-2y = 0\). Let \(x = 1\), then \(y=3\).

Answer:

\(CrO_{3}\) (the third option)