Which equation contains a mistake and needs correction?
a) 2 NO + 2 H₂ -> N₂ + 2 H₂O
b) 2 NO + H₂ -> N₂ + 2 H₂O
c) 2 NO₂ + 2 H₂ -> N₂ + 2 H₂O
d) 2 NO₂ + H₂ -> N₂ + 2 H₂O