Question

What is the oxidation state of each element in COH2?

Answer 1

 first of all will find for carbon
so x+(-2)+(1*2)=0.x=0 
carbon=0. 
For oxygen it will b
;4+x+1*2=0,x=-6. 
Oxygen=-6.  and finally 
For hydrogen; 
4+(-2)+x*2=0;x=-1. 
Hydrogen=-1.
and the overall oxidation state of molecule is zeroo and it is a neutral compound