At a certain temperature, the equilibrium constant `K_(c)` is 1 for the reaction,
`SO_((g))+NO_(2(g))hArrSO_(3(g))+NO_((g))`
If 1.0 mol each of the four gases is taken in a one litre container the concentration of `NO_(2)` at equilibrium would is
A. 1.6 mol `L^(-1)`
B. 0.8 mol `L^(-1)`
C. 0.4 mol `L^-1`
D. 0.6 mol `L^(-1)`
