Practicing Success
What is the oxidation number of \(Cr\) in \(K_2Cr_2O_7\)? |
+4 +5 +6 +7 |
+6 |
The correct answer is option 3. +6. Let the oxidation number of \(Cr\) in \(K_2Cr_2O_7\) be \(x\) We know that, Oxidation number of \(K\) \(= +1\) So, \(2(\text{oxidation number of K}) + 2(\text{oxidation number of Cr}) + 7(\text{oxidation number of O}) = 0\) or, \(2(+1) + 2(x) + 7(-2) = 0\) or, \(+2 + 2x - 14 = 0\) or, \(2x - 12 = 0\) or, \(x = \frac{12}{2}\) or, \(x = 6\) |