Oxidation number of carbon in (NH4)2C2O4

[Emmanuel_Euler]

What is the Oxidation Number of Carbon and Nitrogen In this compound (NH4)2C2O4?? i think the oxidation number of carbon is (+4) and Nitrogen is (-4).
am i true?? or not?
Note:this is not a homework.

 

[DrDu]

I can't judge whether you are true :-)
I only can tell you that you are wrong.

 

[Emmanuel_Euler]

I can't judge whether you are true :-)
I only can tell you that you are wrong.

Can you tell me why and where ??

 

[DrDu]

So let's take NH4-: H has oxidation number +1 and the oxidation numbers have to sum up to the total charge of the ion, -1. That gives -3 for nitrogen. Same argument with C2O42-: Oxygen has oxidation number -2. Leaves me with +3 for carbon.

 

[Borek]

@DrDu - confusing typo in your post, it is NH₄⁺ - unless it was premeditated

 

[Emmanuel_Euler]

Thank you guys. I thought that carbon has a oxidation number of +4 in this compound.
Thank you so much for help.