Correct Answer - B
Oxidation state of nitrogen gas `(N_(2))` is zero, as both the nitrogen atom possess same electronegativity as well as same number of electrons. The oxidation states of ammonia. Nitrous oxide and nitric oxide are given below Ammonia `(NH_(3))`
`x=3(1)=0`
`x=-3`
Nitrous oxide `(N_(2)O)`
`2(x)+1(-2)=0`
`2x=2`
`x=+1`
Nitric oxide (NO)
`x+(-2)=0`
`x=+2`
Thus, nitrogen exhibits lowest oxidation state in case of ammonia
