Assign oxidation numbers to each element in the following ions.
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Question

Assign oxidation numbers to each element in the following ions. 
(d) NO2-

Accepted Answer

Hi everyone. So here we asked the oxidation number of each atom in the following, we have cr Of 4 2 -. We're gonna say X is the oxidation number of chromium. We're gonna X Plus four because we have four oxygen Times oxidation state of oxygen which is gonna be -2. And other compounds other than peroxide and super oxides. And it's gonna be considered charge on the overall compound which is gonna be negative too. So if we solve for X X minus eight was negative too. So if you add eight on both sides, X eagles plus six. But also instead of auction is going to be negative too. An ostrich state of chromium Gonna Be Plus six. And for n. 0. 3 minus we're gonna have X. You got the oxidation number of nitrogen, you're gonna X Plus three because there's three oxygen thomas oxidation state of oxygen which is gonna be negative too. And other compounds other than peroxide and super oxides. And it's going to be equal to overall charge on the compound which is -1. So if we solve for X we're gonna get X -6, it was negative one Will be at 6 to both sides. We're gonna get X. It was Plus five. So for the oxidation state of oxygen we're gonna have negative two in all station state of nitrogen. Then I have plus five. Ever see A. O. We're gonna have X. The oxidation number of calcium, they're gonna have X plus oxidation state of auction which is gonna be negative too. And it's going to be equal to the charge on the overall compound which is going to be zero because this is a neutral compound. So we solve for X. We're gonna get x minus two equals zero. And if we add two on both sides we're gonna get X plus two. But oxidation state of oxygen is gonna be negative too in all states state of calcium family plus two. And then for zinc oxidation state It's gonna be zero. Because for an atom in its element form the oxidation state is zero For H. two. L. We're gonna have X. You get the oxidation number of hydrogen. We're gonna have to top X. Because we have two hydrogen plus oxidation state of oxygen which is gonna be negative too. And other compounds other than peroxide and super oxides. And it's gonna go to the overall charge of the compound which is gonna be zero. Because this is a neutral compound. We're gonna get two. X -2 equals zero. If we add two to both sides we're gonna get to X. It was too, We can divide by two. Software X. And get x equals plus one. And for s. r. two plus as nation states, Australian Going to be Plus two. Because for an eye on the oxidation state is equal to the charge. Thanks for watching my video. And I hope it was helpful

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