The formal charge on the triply bonded oxygen atom in the structure `:O-=C-underset(* *)overset(* *)O:` is ……………..

Explanation

In `:O-=C-underset(* *) overset(* *)O:`
Formal charge on carbon `=N_(v)-[N_(l)+(N_(b))/(2)]= 4 -[0+(8)/(2)]= 4 - 4 = 0`
Formal charge on singly bonded oxygen `= N_(v)-[N_(l)+(N_(b))/(2)]=6-[6+(2)/(2)]=6-7=-1`
Formal charge on triply bonded oxygen `= N_(v)-[N_(l)+(N_(b))/(2)]=6-[2+(6)/(2)]=6 - 5 = +1`